Stephen Clark @StephenClark1 Twitter profile

Last Seen Profiles

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@24_mmrc

Stephen Clark

@StephenClark1

3 years

This new image of NASA’s Ingenuity helicopter on the surface of Mars shows some dust already deposited on its solar panel. Checkouts are planned this week before its first test flight no earlier than Sunday.

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Stephen Clark

@StephenClark1

3 years

Mike Menzel, NASA’s Webb mission systems engineer, with a big statement on JWST fuel life: "Roughly speaking, it’s around 20 years.” It’s the first time the Webb team confirmed the mission might reach its “best-case” fuel life, double the conservative pre-launch estimate.

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Stephen Clark

@StephenClark1

2 years

Artemis 1 is rolling into High Bay 3.

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@StephenClark1

2 years

There's a bat just chilling on the liquid oxygen feed line.

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Stephen Clark

@StephenClark1

1 year

SpaceX's official patch for next week's big show.

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Stephen Clark

@StephenClark1

3 years

The James Webb Space Telescope — 43 days from launch. A breathtaking sight!

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Stephen Clark

@StephenClark1

3 years

The exact launch mass of the James Webb Space Telescope: 6161.4 kilograms. That figure includes 167.5 kg of hydrazine and 132.5 kg of dinitrogen tetroxide for the propulsion system. (1/6)

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Stephen Clark

@StephenClark1

3 years

Numerous lightning strikes over the Atlantic tonight. This one lit up Inspiration4’s Falcon 9 rocket moments ago. Watch live views from Kennedy Space Center:

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Stephen Clark

@StephenClark1

2 years

NASA’s Artemis 1 moon rocket and SpaceX’s Falcon 9 share the scene this morning at Cape Canaveral National Seashore — the first time since 2009 that both pads at Launch Complex 39 have been occupied by rockets.

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Stephen Clark

@StephenClark1

4 years

SpaceX has won a $117 million NASA contract to launch a mission to visit Psyche, a metallic asteroid, using a Falcon Heavy rocket in July 2022. Two secondary science payloads will also be aboard, targeting a separate binary asteroid and Mars.

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Stephen Clark

@StephenClark1

10 months

Here’s a walk around view of Dream Chaser. It will ship later this month to a NASA facility in Ohio for environmental testing, then to Florida for launch on ULA’s second Vulcan rocket.

Eric Berger

@SciGuySpace

10 months

Dream Chaser is finally about to leave its nest. @StephenClark1 got a good look at the vehicle this week:

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Stephen Clark

@StephenClark1

3 years

Covering Inspiration4’s launch from @SpaceflightNow ’s prime perch at the KSC press site. Still a thrill after seeing 160+ launches!

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Stephen Clark

@StephenClark1

6 years

That's a spaceship carrying three people back to Earth, soaring over an African thunderstorm.

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Stephen Clark

@StephenClark1

3 years

My view of the launch of New Shepard-16, Blue Origin’s first human spaceflight.

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Stephen Clark

@StephenClark1

2 years

No more tweets from our @SpaceflightNow account this morning as our account has been locked by Twitter for violating unspecified rules while covering a @SpaceX launch. Sorry folks. @elonmusk

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Stephen Clark

@StephenClark1

1 month

The FAA has given the green light for SpaceX to return to flight with the Falcon 9 rocket this weekend.

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Stephen Clark

@StephenClark1

2 years

NASA’s fully redacted response to my FOIA request for an SLS countdown timeline document that used to be publicly available (physically handed out to reporters at the KSC press site) for shuttle missions.

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Stephen Clark

@StephenClark1

9 months

SpaceX has a reason to celebrate this morning. For the first time, all 33 Raptors worked on the Super Heavy booster.

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@StephenClark1

3 years

Before launch, Keith Parrish, JWST’s commissioning manager, said the mission could reach 20 years of fuel life if the Ariane 5 rocket gave Webb a perfect ride. That’s exactly what the Ariane 5 did.

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Stephen Clark

@StephenClark1

2 years

First light greets NASA’s Artemis 1 moon rocket on the home stretch to pad 39B at the Kennedy Space Center.

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Stephen Clark

@StephenClark1

3 years

I count 1,079 Merlin engine flights to date in the Falcon 9 era, with three early shutdowns in flight. On all three occasions, the rocket completed its primary mission. That puts the Merlin engine success rate above 99.7% in the Falcon 9 era.

Spaceflight Now

@SpaceflightNow

3 years

SpaceX has concluded fatigue on an engine cover caused one of the nine Merlin first stage engines on the company’s most recent launch to shut down early during ascent, leading to the loss of the booster during an offshore landing attempt. Full story:

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@StephenClark1

3 years

NASA’s Kathy Lueders tells a National Academies board that stacking of the SLS core stage for the Artemis 1 mission is scheduled next week, running a few days ahead of schedule for a best-case launch date in November.

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@StephenClark1

2 years

Northrop Grumman's Kurt Eberly says the company has booked three Falcon 9 missions with SpaceX, beginning in the second half of 2023, to launch Cygnus resupply missions to the International Space Station. Northrop hopes to have upgraded Antares 330 ready by end of 2024.

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@StephenClark1

1 year

FAA statement on Super Heavy / Starship license: "After a comprehensive license evaluation process, the FAA determined SpaceX met all safety, environmental, policy, payload, airspace integration and financial responsibility requirements. The license is valid for five years."

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@StephenClark1

2 years

Artemis 1 nears the VAB this morning at the Kennedy Space Center.

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@StephenClark1

4 years

NASA’s Mark Kirasich: All three HLS teams assembled low fidelity mockups during the last 10 months. SpaceX also assembled and demonstrated their Starship elevator concept “in a very short period of time."

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@StephenClark1

3 years

SpaceX’s Bill Gerstenmaier (yes, that Gerst!) says the company recently discovered a potential liquid oxygen loading error. Teams may have been loading too much LOX into Falcon 9 throughout its flight history. SpaceX will assess the issue before proceeding with Crew-2 hotfire.

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@StephenClark1

1 year

SpaceX hits a milestone on the quest for up to 20 flights for each Falcon 9 booster. This booster has now flown 16 times, launching two astronauts and 801 spacecraft in its career.

SpaceX is stretching the lifetime of its reusable Falcon 9 boosters

Each Falcon 9 booster could fly twice as many times as originally intended.

arstechnica.com

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@StephenClark1

2 years

Klaus Pontoppidan, JWST's project scientist the Space Telescope Science Institute, says Webb's first observations within our own solar system will be released Thursday.

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Stephen Clark

@StephenClark1

3 years

Props to @VirginOrbit for this nifty graphic on their launch livestream. Other launch providers, take note.

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@StephenClark1

1 year

I’m excited to announce I'm joining @arstechnica next week as their new space reporter. The space beat is busier than ever, and I’m looking forward to working with @SciGuySpace to cover a growing list of important stories in spaceflight, space science, policy, and business.

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Stephen Clark

@StephenClark1

2 years

NASA’s Steve Stich says, among a few other minor changes, the Crew Dragon Freedom spacecraft debuting next month will offer USB ports for astronauts to recharge their laptops.

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@StephenClark1

3 years

SpaceX’s live webcast of the Inspiration4 launch tomorrow starts four hours before liftoff, but will end after orbit insertion. There’s no non-stop video coverage planned throughout the flight, like the usual marathon broadcast NASA hosts during Dragon trips to and from ISS. 1/2

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@StephenClark1

1 year

Russia's first lunar mission since 1976 is on its way.

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@StephenClark1

3 years

NASA commander Raja Chari says his crew has named the next Crew Dragon spacecraft “Endurance” ahead of its first launch Oct. 30.

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@StephenClark1

3 months

SpaceX demonstrated today that its towering Super Heavy booster and Starship rocket might one day soon be recovered and reused in the manner Elon Musk has envisioned for the future of space exploration.

SpaceX’s Starship took a beating but held on for first return from space

"I think we should try to catch the booster with the mechazilla arms next flight!"

arstechnica.com

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Stephen Clark

@StephenClark1

3 years

SpaceX is currently lifting a Falcon 9 rocket and Crew Dragon spacecraft vertical on pad 39A at Kennedy Space Center. Watch live:

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@StephenClark1

2 years

Falcon 9 and Dragon Endeavour are moving up the ramp to LC-39A this afternoon. Static fire tomorrow, then launch Friday on Axiom's Ax-1 commercial crew mission to the International Space Station.

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@StephenClark1

3 years

Some news. No Falcon Heavy this year.

Spaceflight Now

@SpaceflightNow

3 years

The next flight of SpaceX’s Falcon Heavy rocket, previously scheduled for this month, has been pushed back to early 2022 after more delays caused by its U.S. military payload, according to a Space Force spokesperson. Read more:

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@StephenClark1

3 years

Hard to beat this office view.

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@StephenClark1

3 years

Falcon 9 goes supersonic, hauling into orbit a new navigation beacon for the GPS constellation.

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@StephenClark1

2 years

SpaceX ops never stop. A brand new Falcon booster was on the move toward Hangar X less than two hours after another Falcon 9 launched from the Cape. And there’s a Starship ground tank on dock at KSC today.

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@StephenClark1

3 years

A snapshot of shuttle Atlantis rising 10 years ago, as viewed from my remote camera on the southwest perimeter of pad 39A.

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@StephenClark1

4 years

A flight plan for a WB-57 airborne surveillance aircraft shows it could be over Boca Chica just before 3pm CST, presumably for aerial imagery of the Starship SN8 test flight.

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1 year

After a bogus block of the @nasaspaceflight stream of the Ax-2 launch yesterday, @MBCGroup has done the same ridiculous thing to our @SpaceflightNow coverage.

Chris Bergin - NSF

@NASASpaceflight

1 year

@_mgde_ @Space_Station @Axiom_Space @SpaceX Our livestream, which includes our own cameras at KSC is blocked due to some Saudi media conglomerate claiming they own it. Unbelievable.

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3 years

In an email to news media, the Space Telescope Science Institute says it has received “official word” from NASA that launch the James Webb Space Telescope has been set for 7:20am EST on Dec. 24.

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@StephenClark1

4 years

Hans Koenigsmann, SpaceX: “We’re close to making our ninth flight” with a single Falcon 9 booster. “I believe it’s our next flight coming up.”

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@StephenClark1

9 months

Bradley Smith, director of NASA's Launch Services Program, says the agency's Mars-bound ESCAPADE smallsats will fly on an "incredibly ambitious first launch for (Blue Origin's) New Glenn" rocket "around this time next year."

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@StephenClark1

4 years

Next three Falcon 9 launches: - June 12 at 5:42am EDT (0942 GMT): F9/Starlink/SkySats from pad 40 - June 22 at 6:20pm EDT (2220 GMT): F9/Starlink/BlackSky from pad 39A - June 30 at 3:55pm EDT (1955 GMT): F9/GPS 3-3 from pad 40

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@StephenClark1

3 years

In the past few weeks, SpaceX has been disassembling the original Starship launch structure it built a couple years ago at pad 39A. That has cleared the way for construction of a new orbital launch site.

Elon Musk

@elonmusk

3 years

Construction of Starship orbital launch pad at the Cape has begun

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Stephen Clark

@StephenClark1

6 months

Starship is poised to head to space again tomorrow.

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@StephenClark1

1 year

Super Heavy and Starship coming to life at Starbase this morning -- great view! Joint coverage with @SpaceflightNow and @LabPadre :

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@StephenClark1

9 months

NASA says SpaceX’s next Starship test flight may include a propellant transfer demonstration.

NASA says SpaceX’s next Starship flight could test refueling tech

SpaceX appears on track for at least a preliminary propellant transfer test next year.

arstechnica.com

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@StephenClark1

3 years

For those eager to see the SLS core stage vertical, here’s a reminder of the access NASA provided media for real-time reporting of the last lift/mate operation in the VAB. The pics would be out if NASA still did this. Unfortunately, there’s no access, despite requests.

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Stephen Clark

@StephenClark1

11 months

Touchdown! Seven years and 4.4 billion miles since launch, OSIRIS-REx has returned to Earth with pieces of an asteroid.

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Stephen Clark

@StephenClark1

2 years

A US Space Force spokesperson says the payload issues that caused two years of delays for the USSF-44 mission are now resolved. Launch is scheduled for Friday, Oct. 28.

Spaceflight Now

@SpaceflightNow

2 years

More than three years after SpaceX's Falcon Heavy rocket last blazed a path into orbit, the 28-engine launcher is finally set to fly again from Florida as soon as Oct. 28 on a long-delayed US Space Force mission, a spokesperson said. 📷: @scriptunasphoto

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4 years

Roscosmos has released some rare views of the business end of the Soyuz rocket. Perhaps the best view I’ve ever seen of the Soyuz torch ignition system — essentially giant matchsticks. More photos:

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1 year

Varda Space Industries seeks to become the third company to recover a capsule from orbit, and the first to do it with a vehicle developed outside of NASA’s crew/cargo programs. The landing window opens July 17, but it’ll likely occur later in the month.

In-space manufacturing startup aces pharma experiment in orbit

One more big test remains for Varda's first-of-its-kind "space factory."

arstechnica.com

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@StephenClark1

2 years

Boeing’s Mark Nappi, in a post-launch press briefing, says two OMAC thrusters on the Starliner spacecraft failed during the orbital insertion burn. On-board flight control system took over and switched to backup thrusters to complete the burn, and Starliner is in a good orbit.

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@StephenClark1

2 years

NASA has released launch video from a rocketcam on the Artemis 1 moon rocket as it climbed away from pad 39B. We didn't see this live during the liftoff.

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@StephenClark1

1 year

Gerst added that SpaceX is in the process of certifying Falcon 9 boosters for up to 20 flights on Starlink missions.

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@StephenClark1

3 years

The nominal mission timeline shows JWST should have extended its sunshield booms by now. NASA has repeatedly said the team has flexibility in that schedule, but the lack of any official updates leaves no insight into how things are going.

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27 days

NASA and Boeing have now committed at least $6.7 billion on the Starliner program, more than twice what SpaceX earned for a similar scope of work it completed last year on Crew Dragon.

Boeing’s Starliner has cost at least twice as much as SpaceX’s Crew Dragon

"Risk remains that we may record additional losses in future periods."

arstechnica.com

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3 months

After three test flights, SpaceX has shown that the world's most powerful rocket can reach space. Now, SpaceX wants to prove Starship can get back home.

Surviving reentry is the key goal for SpaceX’s fourth Starship test flight

Elon Musk says SpaceX aims to launch the fourth Starship test flight in about two weeks.

arstechnica.com

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Stephen Clark

@StephenClark1

1 year

Centaur V test anomaly at NASA Marshall. This kind of transparency (granted, it came with some prodding) is greatly appreciated and should be an industry norm. Sadly, it is not.

Tory Bruno

@torybruno

1 year

Outside of the test rig/ stand. Test article is inside (you can’t see it). Hydrogen leak. H2 accumulated inside the rig. Found an ignition source. Burned fast. Over pressure caved in our forward dome and damaged the rig.

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Stephen Clark

@StephenClark1

2 years

America's three crew-rated launch pads for orbital and lunar missions.

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@StephenClark1

2 years

It's been nearly 24 hours since our @SpaceflightNow account was locked by Twitter while we covered a SpaceX launch yesterday. We have appealed to @TwitterSupport . Our account was locked immediately after sending this tweet, which included a replay of the rocket landing.

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Stephen Clark

@StephenClark1

10 months

Varda is looking to Australia after delays in obtaining US government approvals for reentry. The company's second mission, scheduled for mid-2024, may return to land in Australia rather than in the United States.

Varda looks to Australia after delays in obtaining US reentry approval

“It’s always been in the plan, but we definitely accelerated this.”

arstechnica.com

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@StephenClark1

2 years

SpaceX's Sarah Walker says the company is making "good progress" toward having Pad 40 at Cape Canaveral SFS ready to support launches of Dragon cargo missions to the International Space Station in the fall, then will add in crew launch capability later.

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5 months

"I would have never written the requirements for Starship... My mental model wouldn’t frame around that kind of capacity, at that price point, at that scale... So what we’re relying on is industry to help us innovate by showing us the art of the possible."

Pentagon calls for tighter integration between military and commercial space

"I would have never written the requirements for Starship."

arstechnica.com

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@StephenClark1

3 years

SpaceX’s Benji Reed: The Falcon 9 landing failure last month was caused by a hole in a “boot” on one of the Merlin engines that allowed in hot gas, triggering an engine shutdown. The boot on this particular engine had flown more times than any other F9 engine boot.

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9 months

I’d say that was an “less than an average summer rainfall event” yesterday.

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@StephenClark1

3 years

A look around the Delta 2 exhibit at the KSC Visitor Complex. It brings some color to the rocket garden!

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@StephenClark1

3 years

NASA’s Steve Stich: SpaceX’s Crew-5 mission in the fall will likely have a Russian crew member, and will likely utilize a new Falcon 9 booster.

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@StephenClark1

2 months

SpaceX's investigation into a Falcon 9 upper stage engine failure will likely have repercussions for two crew launches slated to fly in the next six weeks.

SpaceX’s unmatched streak of perfection with the Falcon 9 rocket is over

The Falcon 9 is grounded pending an investigation, possibly delaying upcoming crew flights.

arstechnica.com

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@StephenClark1

1 year

Starship from 3.9 miles away.

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@StephenClark1

9 months

Blue Origin sure seems confident it will launch New Glenn in 2024.

Blue Origin sure seems confident it will launch New Glenn in 2024

Does Jeff Bezos's heavy-lift rocket really have a shot at launching next year?

arstechnica.com

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@StephenClark1

10 months

If the next Starship makes it through staging, you can call that a win.

If the next Starship makes it through staging, you can call that a win

A key moment will come 2 minutes and 41 seconds into the next Starship test flight.

arstechnica.com

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@StephenClark1

3 years

With this mission, Northrop Grumman’s Antares rocket has flown more times in the last 12 months than ULA’s Atlas 5.

Spaceflight Now

@SpaceflightNow

3 years

Northrop Grumman’s Antares rocket is soaring into a clear sky over Wallops Island, Virginia, carrying the S.S. Ellison Onizuka Cygnus supply ship toward the International Space Station.

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2 years

A statement from NASA on the Dragon heat shield concern, which is not associated with any recent re-entry but with a new composite heat shield structure that failed SpaceX's acceptance testing for the upcoming Crew-5 mission. Crew-5 will now use a different heat shield structure.

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1 year

In a press briefing previewing the Ax-2 mission, SpaceX's Bill Gerstenmaier says Falcon 9 rockets for future crew missions, beginning with Ax-2, will have ability to land boosters back at the launch site. They previously had to land on a drone ship after launching crew missions.

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3 years

21 current and former Blue Origin employees voice concerns about the company’s “toxic” culture, alleging sexism and management's active stifling of dissent. Essay: CBS interview with @Ally_Abrams :

Current and former Blue Origin employees say workplace culture and safety practices lacking

A group of 21 current and former Blue Origin employees are making serious allegations in an essay about the company's safety practices and workplace culture. In an interview you'll see only on “CBS...

www.cbsnews.com

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@StephenClark1

3 years

With Webb’s launch seemingly now on track for Dec. 24, we can presume the observatory was encapsulated today inside the Ariane 5 fairing. A huge milestone and the last time anyone will lay eyes on Webb. But no word from NASA.

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Stephen Clark

@StephenClark1

2 years

Also: Artemis 1’s launch is no earlier than June 6, with a two-hour window opening at 12:48pm EDT.

Spaceflight Now

@SpaceflightNow

2 years

SpaceX’s next Falcon Heavy mission is now targeted for June, followed by the launch Aug. 1 of NASA’s Psyche asteroid explorer on another Falcon Heavy. See our updated launch schedule:

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@StephenClark1

10 months

Thierry Breton, the EU's internal market commissioner, confirmed today that the European Commission has reached a 180 million euro ($192m) deal with SpaceX for two Falcon 9 launches set for April and July next year, each deploying two Galileo navigation satellites.

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@StephenClark1

3 years

Like an artist’s signature, the exhaust left behind by Lucy’s Atlas 5 rocket is still visible in the atmosphere more than an hour after launch.

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@StephenClark1

1 year

ESA doesn't plan to live-stream the Ariane 6 rocket's upcoming long-duration hotfire test on its launch pad in French Guiana. This is an unfortunate decision, and should be reconsidered. NASA, SpaceX, and ULA have live-streamed comparable tests.

ESA still seems shy about sharing news on Ariane 6 rocket testing

Officials don't plan to broadcast a key Ariane 6 test-firing on its launch pad.

arstechnica.com

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@StephenClark1

1 year

Foreground: A lone jogger at sunrise this morning. Background: SpaceX technicians gather around the Super Heavy / Starship rocket on its launch mount following Monday's scrubbed countdown.

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@StephenClark1

11 months

The Spanish company PLD Space has just launched their first Miura 1 rocket on a test flight to suborbital space. This is a stepping stone toward a partially reusable orbital-class rocket.

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@StephenClark1

6 months

Starship Flight 3 departs Boca Chica.

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@StephenClark1

3 years

This is the 540-horsepower rig that will pull the Ariane 5 rocket and the James Webb Space Telescope the 1.7 miles (2.7 km) to the launch pad this morning in French Guiana (my pics from a previous mission).

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@StephenClark1

8 months

United Launch Alliance's fully-stacked Vulcan rocket just entered the wild for the first time.

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@StephenClark1

3 years

A helicopter from SpaceX’s “Go Searcher” recovery ship is inbound to Kennedy Space Center. The Inspiration4 crew is believed to be onboard.

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7 months

Elon’s pretty confident Starship will get to orbit on its next test flight. Meanwhile, the NASA official perhaps most plugged in with Starship anticipates up to 10 test flights this year.

Elon Musk’s recent all-hands meeting at SpaceX was full of interesting news

Starship exploded during a liquid oxygen vent on its most recent test flight.

arstechnica.com

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@StephenClark1

9 months

China launched their own military spaceplane into orbit this week, days after the US military was supposed to launch their's. The Space Force's top general says the timing of China's launch was "probably no coincidence."

Space Force chief: Timing of Chinese spaceplane launch “no coincidence��

US and Chinese spaceplanes are "two of the most watched objects" in orbit.

arstechnica.com

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Stephen Clark

@StephenClark1

3 years

An interesting note from the Aerospace Safety Advisory Panel meeting: Panel member David West says SpaceX's Crew Dragon spacecraft will do a 360-degree flyaround of the ISS after departing in early-mid November, the first 360-degree flyaround by a US crew craft since the shuttle.

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@StephenClark1

8 months

SpaceX is the king of upmass. The mass equivalent of nearly three International Space Stations launched as payloads on Falcon rockets this year.

SpaceX launches two rockets—three hours apart—to close out a record year

This was the shortest time between orbital launches at Cape Canaveral since 1966.

arstechnica.com

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@StephenClark1

1 year

Europe's Euclid telescope, at $1.5 billion, will become the most costly unclassified payload ever launched by SpaceX when it lifts off from Cape Canaveral at 11:12am EDT. I had the chance to visit the telescope inside a clean room near the Cape a few weeks ago. 📷 @cbs_spacenews

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@StephenClark1

3 years

NASA says Axiom’s first private astronaut mission to the International Space Station is now scheduled for March 30, and will use SpaceX’s Crew Dragon Endeavour spacecraft — apparently a change from an earlier assignment to Crew Dragon Resilience

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3 years

State Dept. spokesperson Ned Price: Russia earlier today “recklessly conducted a destructive anti-satellite test of a direct ascent anti-satellite missile against one of its own satellites.” So far, the test generated more than 1500 pieces of trackable orbital debris.

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