NASA Administrator Jared Isaacman

Serving President Donald J. Trump as the 15th @NASA Administrator | Leading the next Golden Age of space discovery 🚀

[NASA Administrator Jared Isaacman @NASAAdmin]

I love my job. Honored to serve 🇺🇸

[NASA @NASA]

This spiral galaxy, recently observed by @NASAHubble, is in the middle of a cosmic journey that will take it hundreds of millions of years. Learn more: https://t.co/ebWeGyWicp

[NASA Administrator Jared Isaacman @NASAAdmin]

X-59 goes through the number! Congrats to the @NASA and @LockheedMartin🦨 teams!

At @NASAArmstrong , we are rebuilding our X-plane portfolio and getting NASA back in the business of radical airframe and engine flight test!. Today was another small step in the right direction 🇺🇸

[NASA Aeronautics @NASAaero]

✈️ JUST IN: The X-59 has gone supersonic!

The X-59 achieved supersonic speeds for the first time ever today — a major milestone for NASA’s Quesst mission and an important step toward upcoming flights that will demonstrate its quiet supersonic technology ahead of future community overflights.

Fast now. Quiet soon. 🔊➡️🤫

Learn more: https://t.co/lpVA3qRxAj

#NASA #X59 #Quesst

[Bethany Stevens @NASASpox]

Roscosmos has paused Friday’s structural repair efforts inside the Zvezda service module transfer tunnel, known as PrK, as more measurements and data is assessed. Given this development, NASA has instructed the crew members inside the Dragon spacecraft to end the safe haven procedures and return to planned operations aboard the International Space Station. We look forward to working with Roscosmos on a collaborative approach to address the leaks.

[NASA Administrator Jared Isaacman @NASAAdmin]

Based on the data center market, there will already be plenty of capital going into solar, which makes sense in cis-lunar space. But if we are going to put outposts in permanently shaded regions or truly explore the outer solar system past Jupiter, we are going to need nuclear power and propulsion. Our job at NASA is to pioneer breakthrough new exploration capabilities that others are not capable of undertaking.

[Aaron Lukas @DepDNILukas]

Congratulations to Director Pulte! Looking forward to welcoming him at ODNI and working together on the President's mission of transparency, truth, and keeping the American people safe. @pulte

[Bethany Stevens @NASASpox]

The Zvezda service module transfer tunnel, known as PrK, has suffered from cracks and leaks for some time, and has been mitigated by Roscosmos as much as possible to date. The cracks have always been a concern that NASA watches very closely. NASA and Roscosmos have been working to determine the root cause of the cracks, and Roscosmos manages the issue through operational mitigation measures and periodic partial-repair efforts.

Following new leaks, Roscosmos has elected to proceed with a more extensive repair operation on Friday, June 5. Out of an abundance of caution, NASA has directed all four of the agency's SpaceX Crew-12 members and NASA astronaut Chris Williams to assume an elevated safety posture in the Dragon spacecraft while the repair is underway.

We continue to work with our Russian counterparts, along with the rest of the international community that supports the space station, to arrive at a more permanent resolution.

[NASA Administrator Jared Isaacman @NASAAdmin]

This is an incredible achievement. Congrats to all involved on moving so quickly to accomplish this milestone.

[Office of Nuclear Energy | US Department of Energy @GovNuclear]

🎉 WE HAVE CRITICALITY! 🎉

On June 4, 2026, at around 12:30 MDT, @AntaresNuclear’s Mark-0 microreactor achieved initial criticality at @INL.

It is the first nuclear test reactor to go critical under @ENERGY’s Reactor Pilot Program. Congratulations to Antares on reaching this historic milestone!

[Senator Dave McCormick @SenMcCormickPA]

It was great to meet with Pittsburgh native @AstroIronMike and celebrate the success of @NASA’s Crew-11 mission.

Mike’s leadership is a testament to the innovation, talent, and determination that continue to make Pennsylvania proud.

[NASA Administrator Jared Isaacman @NASAAdmin]

@SenMcCormickPA @AstroIronMike @NASA I like it

[NASA Administrator Jared Isaacman @NASAAdmin]

@shanksteroflove We are announcing the Artemis III crew next week. Tune in, because we will also be providing a confidence update on the mission.

[NASA Administrator Jared Isaacman @NASAAdmin]

That is not correct. You can look up what the SLS Block 1B cargo variant can send to TLI, and that mass is well below the public MK2 data.

And to be clear, NASA is very focused on assisting Blue Origin with root cause analysis, pad recovery, and, most importantly, continuing to advance a lander that can meet Artemis III and crewed landing timelines.

[NASA Administrator Jared Isaacman @NASAAdmin]

The race back to the Moon is on, and America will lead.

We’re leveraging the talent, technology, and national commitment needed to return astronauts to the lunar surface before the end of 2028.

This time, we’re going not just for flags and footprints, but to build the capabilities to stay and prepare for Mars.

[Jeff Bezos @JeffBezos]

One week later, incredible progress. It’s a 24/7 operation with a solid path forward to launch this year, helped by a lot of luck. @NASA and @USSpaceForce have both been extremely helpful.

This team. Never tell them the odds.

[NASA Administrator Jared Isaacman @NASAAdmin]

Thanks to @POTUS and the national space policy, America has a real advantage…but this is a close race. China is moving quickly, and the timeline could come down to months, not years.

We’re moving with urgency to return American astronauts to the lunar surface before 2028 and ensure America leads in the next chapter of lunar exploration.

[NASA Administrator Jared Isaacman @NASAAdmin]

Setbacks happen in this business. What matters is how we respond.

NASA is deploying experts to help determine root cause, support recovery efforts, and keep critical lunar systems moving forward. We are putting extreme focus on the lander to ensure timelines for the Artemis III orbital test mission remain on schedule.

At NASA, we remain laser focused on our mission to return astronauts to the lunar surface before 2028. We test, we learn, we improve and we will never stop until the objective is achieved.

[NASA Administrator Jared Isaacman @NASAAdmin]

That’s right. Under budget AND ahead of schedule.

Looking forward to seeing the beginning of the world-changing Nancy Grace Roman Space Telescope NET August 30.

[Jeff Foust @jeff_foust]

NASA's Joel Montalbano says at the ASEB meeting this afternoon that the "early September" launch date for the Roman Space Telescope is now Aug. 30.

[NASA Administrator Jared Isaacman @NASAAdmin]

Roman is launching ahead of schedule and under budget, a testament to the extraordinary teams across NASA and industry who turned an ambitious vision into reality.

This mission will transform how we see the universe and help answer questions humanity has pursued for generations.

Looking forward to launch.

[NASA @NASA]

Our @NASARoman space telescope is officially slated to launch on Aug. 30!

Get the details and follow Roman's journey on our new Roman Space Telescope blog: https://t.co/72iud38kMm

[NASA Administrator Jared Isaacman @NASAAdmin]

I respectfully have a different take...

A major vendor, @UnionPacific, decided to paint one of its locomotives in patriotic colors to celebrate America’s 250th birthday as it transports components of a NASA rocket. They also decided to paint “45 47” on the train to recognize the sitting President during this important anniversary. Now, I understand if someone served in a different administration, from a different political party, there may be a bias, but through my lens, what Union Pacific is doing is patriotic.

We also happen to be celebrating a lot of NASA’s “meaningful achievements,” including the giant Saturn V, the Moon landing, and other historical moments projected on the Washington Monument during America’s 250th birthday. We similarly have those accomplishments displayed at NASA centers to recognize these historic and world-changing achievements, but it is unlikely we can ask vendors to paint them on every locomotive.

[Lori Garver @Lori_Garver]

Celebrating shipping parts of a rocket funded by taxpayers for 16 yrs to the tune of $30B+ for just its 3rd launch (this one to LEO) for POTUS & the 250th? @NASA’s many achievements have contributed to new knowledge & discoveries in Earth & space science, aeronautics & exploration that have benefited humanity, inspired the world & returned unmeasurable economic value. As a crown jewel of our nation, I look forward to celebrating NASA’s more meaningful achievements, not just those the current President wants “credit” for starting (we are more than a cage match).

[NASA Administrator Jared Isaacman @NASAAdmin]

The locomotive honoring America’s 250th anniversary and @POTUS is now hauling the solid rocket booster segments that will help power Artemis III.

The Artemis program began under President Trump’s first term. Now the hardware for humanity’s return to the lunar surface is moving down the tracks.

[Union Pacific @UnionPacific]

🚀 From America’s rails to the moon! 🌕 Built by @WabtecCorp and unveiled with @northropgrumman , our newest commemorative locomotive #up4547 began its first mission hauling @NASA Artemis III rocket components, powering the next era of exploration.

Former NASA astronaut Doug Hurley captured it well at the unveiling ceremony: “Together, we are taking the next leap for humanity.” https://t.co/X9rN4NDS70