Stephen Clark

Stephen Clark

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Space reporter at Ars Technica; covers NASA, SpaceX, international launch and satellites.

Orion Heat Shield Passes Reentry, Crew Remains Safe
SocialApr 11, 2026

Orion Heat Shield Passes Reentry, Crew Remains Safe

I just had a moment to chat with Lori Glaze, head of the Artemis program, about how the Orion heat shield held up during reentry yesterday. She said they have imagery in hand from divers at the splashdown site, but...

By Stephen Clark
Houston Prepares to Greet Artemis II Crew Returning From Moon
SocialApr 11, 2026

Houston Prepares to Greet Artemis II Crew Returning From Moon

The stage is set for Houston to welcome the Artemis II crew home from the Moon. https://t.co/Nwu7iSX1i3

By Stephen Clark
Artemis II Nails Precision: Distance, Speed, Reentry on Target
SocialApr 11, 2026

Artemis II Nails Precision: Distance, Speed, Reentry on Target

Artemis II return stats, per flight director Rick Henfling (via FDO): • Distance traveled: 700,237 miles • Top speed: 24,664 mph • Reentry angle: Within 0.4% of target • Entry distance: 1,957 miles • Landing location: Within 1 mile of target

By Stephen Clark
Orion Returns Home After Crew Module Separation
SocialApr 10, 2026

Orion Returns Home After Crew Module Separation

Orion is coming home. Good crew module sep. Godspeed the crew of Artemis II. https://t.co/aYgG56dcMb

By Stephen Clark
NASA to Fix Orion’s Leaky Helium Valves Before Artemis
SocialApr 10, 2026

NASA to Fix Orion’s Leaky Helium Valves Before Artemis

NASA will likely redesign Orion's leaky helium valves before sending the next Artemis crew to the Moon. https://t.co/ZB5x5JbH0t

By Stephen Clark
Blue Checks Second-Stage Impacts Despite Unrelated Hardware
SocialApr 9, 2026

Blue Checks Second-Stage Impacts Despite Unrelated Hardware

This is not hardware for the third New Glenn launch scheduled for later this month, but I'm sure Blue is checking for any effects on the second stage on that vehicle.

By Stephen Clark
Unexpected Celestial Glitch Becomes Artemis II’s Greatest Gift
SocialApr 9, 2026

Unexpected Celestial Glitch Becomes Artemis II’s Greatest Gift

It was an accident of celestial mechanics, but ended up becoming one of the "greatest gifts" of the Artemis II mission. https://t.co/Tg8VGfIpjl

By Stephen Clark
Artemis II May Only Teach Us How to Explore Again
SocialApr 9, 2026

Artemis II May Only Teach Us How to Explore Again

So what, exactly, is Artemis II's contribution to our knowledge of the Moon? Maybe it's just relearning how humans can explore. https://t.co/yslyyDUYUA

By Stephen Clark
Artemis II Hits Moon at 4,067 Miles, Reaches 252,756 Miles
SocialApr 6, 2026

Artemis II Hits Moon at 4,067 Miles, Reaches 252,756 Miles

Astronaut Jenni Gibbons, in Houston, transmits the latest information on Artemis II's trajectory to astronaut Victor Glover, a quarter-million miles away. Closest approach to the Moon: 7:00:46 pm EDT at a distance of 4,067 miles Farthest distance from Earth: 7:02:51 pm...

By Stephen Clark
Artemis II Commander Shares iPhone Moon Snapshot
SocialApr 6, 2026

Artemis II Commander Shares iPhone Moon Snapshot

iPhone pic of the Moon from Artemis II commander Reid Wiseman, a sneak peek of what's to come. https://t.co/FnkGVlOeay

By Stephen Clark
Four Astronauts Become Humanity's Most Distant Explorers, Emotional
SocialApr 6, 2026

Four Astronauts Become Humanity's Most Distant Explorers, Emotional

Reid, Victor, Christina, and Jeremy have become the most distant explorers in human history. Wow. I'm not sure I was ready for the emotional weight of that moment.

By Stephen Clark
Artemis II Replay Highlights Launch Abort System Jettison
SocialApr 4, 2026

Artemis II Replay Highlights Launch Abort System Jettison

Going through some of NASA's Artemis II launch replays, and this one showing Launch Abort System jettison pops. https://t.co/sa9Byen6VT

By Stephen Clark
Artemis II Launch Reveals SRB Staging and Early Moonrise
SocialApr 2, 2026

Artemis II Launch Reveals SRB Staging and Early Moonrise

NASA has posted rocket cam views from the launch of Artemis II. Here's SRB staging and the Moonrise the crew observed at T+5 minutes. https://t.co/paJDONlg0a https://t.co/M9lkXnDjHu

By Stephen Clark
Moon Missions Require Unity and Will, Not Just Money
SocialApr 2, 2026

Moon Missions Require Unity and Will, Not Just Money

Hearts and minds are too heavy for any rocket (or dollars) to carry all the way to the Moon. For that, it takes unity and will, qualities that aren't so easy to measure.

By Stephen Clark
Artemis II Crew Witnesses Rare Earth Sunset From 44,000 Mi
SocialApr 2, 2026

Artemis II Crew Witnesses Rare Earth Sunset From 44,000 Mi

On their first apogee, nearly 44,000 miles from Earth, the Artemis II crew is getting a look at home unseen in 53 years. Here's Christina Koch describing her view of sunset in India a few minutes ago. https://t.co/uBZmQjCoFt

By Stephen Clark
First Crew Walkout Coverage: A Historic Moment Witnessed
SocialApr 1, 2026

First Crew Walkout Coverage: A Historic Moment Witnessed

My first time covering a crew walkout in person. It was worth a moment to take in the history. https://t.co/yFAJKAT1Jd

By Stephen Clark
Artemis II Fueling Begins at Kennedy, Launch Day Overview
SocialApr 1, 2026

Artemis II Fueling Begins at Kennedy, Launch Day Overview

Fueling has started at Kennedy Space Center. Here’s a rundown of all the big events for Artemis II launch day. https://t.co/avBdoxvMmi

By Stephen Clark
US Military Outlines Emerging Moon Strategy
SocialApr 1, 2026

US Military Outlines Emerging Moon Strategy

The US military is developing a strategy for the Moon. Here's where things stand. https://t.co/7DZaZ8Dmnn

By Stephen Clark
This Week's Space Highlights:
SocialMar 27, 2026

This Week's Space Highlights:

In this week's Rocket Report: • Artemis II on track for launch next week • Russia reopens gateway to ISS • Space Force could move more payloads off Vulcan • Russia's Starlink takes flight • Isar scrubs launch attempt https://t.co/QKQhAwmre4

By Stephen Clark
Space Warfare Mirrors 1930s Air Superiority Era
SocialMar 19, 2026

Space Warfare Mirrors 1930s Air Superiority Era

“Where we are today in space warfare is very similar to where air superiority was in the 1930s.” https://t.co/vdPDSKfwkt

By Stephen Clark
Space
SocialMar 13, 2026

Space

In this week's Rocket Report: • Artemis II clears flight readiness review • SpaceX activates second Starbase launch pad • Firefly successfully returns to flight • Pentagon orders high-altitude missile interceptors https://t.co/MhSVS4wljv

By Stephen Clark
Anduril Expands Space Ops with Three Missions, Major Sensor Acquisition
SocialMar 11, 2026

Anduril Expands Space Ops with Three Missions, Major Sensor Acquisition

Anduril's space business is growing, with at least three missions in the pipeline and, now, the acquisition of the world's largest space sensor network. https://t.co/QiWvE96S5k

By Stephen Clark
This Week's
SocialMar 6, 2026

This Week's

In this week's Rocket Report: • Artemis shakeup • SpaceX price hike • Russia repairs Soyuz launch pad • Japan's Space One now 0-for-3 • PLD raises $209 million https://t.co/WKoo20b4gS

By Stephen Clark
Abandoned Soyuz Pad Finds New Tenant After Four Years
SocialMar 3, 2026

Abandoned Soyuz Pad Finds New Tenant After Four Years

It looks like four years of disuse have taken its toll on the Soyuz launch pad in French Guiana. Now, it has new tenant.

By Stephen Clark
GPS Satellite Ready for Launch, Vehicle Still Undecided
SocialFeb 26, 2026

GPS Satellite Ready for Launch, Vehicle Still Undecided

The next GPS satellite is at Cape Canaveral, preparing for launch. Whether it flies on Vulcan or Falcon 9 is up in the air. https://t.co/XxmkgevJk3

By Stephen Clark
Launch Still On Track, New Payload Added to Blue Ring
SocialFeb 25, 2026

Launch Still On Track, New Payload Added to Blue Ring

Tory told me yesterday this is still on track for launch later this year. He has the team working on adding a new payload to Blue Ring for the first test flight, but wasn't ready to offer specifics.

By Stephen Clark
Artemis II Wet Dress Rehearsal Completes Without Major Issues
SocialFeb 20, 2026

Artemis II Wet Dress Rehearsal Completes Without Major Issues

NASA has reached the end of today's Artemis II Wet Dress Rehearsal with no major issues reported. https://t.co/CwpiNIEJYz https://t.co/rPZmmaWMuf

By Stephen Clark
Artemis II Teams Stay Below Hydrogen Leak Safety Limit
SocialFeb 19, 2026

Artemis II Teams Stay Below Hydrogen Leak Safety Limit

This is encouraging: "Teams reached this step without exceeding the ground safety limit of the hydrogen leak concentration, as was observed during the first Artemis II wet dress rehearsal."

By Stephen Clark
NASA Let Hydrogen Leak Grow During Artemis Gap
SocialFeb 14, 2026

NASA Let Hydrogen Leak Grow During Artemis Gap

It turns out NASA used the three-year interim between Artemis I and Artemis II to get comfortable with a more significant hydrogen leak, instead of fixing the leaks themselves. https://t.co/XX1eeIJnR0

By Stephen Clark
Legacy GEO Giant Eutelsat Shifts Focus to LEO
SocialFeb 14, 2026

Legacy GEO Giant Eutelsat Shifts Focus to LEO

This is pretty remarkable. Eutelsat is one of the big three legacy GEO operators, now pivoting to LEO.

By Stephen Clark
Space Systems Command Confirms Two GSSAPs on USSF‑87
SocialFeb 13, 2026

Space Systems Command Confirms Two GSSAPs on USSF‑87

Space Systems Command says there were two GSSAPs on USSF-87. This is their response to my question on the matter last month. https://t.co/IqQ6LR4m9P

By Stephen Clark