NASA’s massive moon rocket is finally ready for launch

The SLS is just days away from its first trip into space.

NASA’s massive new moon rocket — the Space Launch System (SLS) — is finally ready for launch, putting humans a major step closer to once again walking on the moon’s surface.

The rocket: The SLS is one of the biggest rockets ever built, standing 322 feet tall and weighing 5.5 million pounds at launch. For comparison, NASA’s Saturn V — its last moon rocket, first launched in 1967 — was 363 feet tall and weighed 6.2 million pounds.

The SLS is the most powerful rocket ever built, generating 15% more thrust than the Saturn V. That will allow it to send an Orion capsule — with or without astronauts — past low Earth orbit and toward the moon, Mars, or deeper space.

The four-mile journey from the hanger to the launchpad took 10 hours.

Ready for launch: When NASA began developing the SLS in 2011, the plan was to have the rocket ready for an uncrewed test flight in 2016 — but that launch has been delayed more than a dozen times.

Now, for seemingly the first time ever, something involving the SLS is ahead of schedule: NASA had planned to wait until August 18 to move the moon rocket to its launchpad at Kennedy Space Center, but decided last-minute to accelerate the schedule by two days.

It took nearly 10 hours for the SLS to make the four-mile journey from its hanger to the launchpad aboard crawler-transporter 2 (CT-2), a tank-like vehicle larger than a baseball infield, but the trip went off without a hitch.

Soon: NASA is now prepping the SLS rocket systems for launch. The first two-hour window for that opens on ​August 29 at 8:33 a.m., but if that doesn’t pan out, NASA has September 2 and 5 as backups. You can watch the livestream of the launch via the livestream below.

During this first flight, an uncrewed Orion capsule will journey around the moon before returning to Earth 42 days later for an ocean splashdown. According to the latest plan, NASA will then use an SLS to send an Orion capsule crewed by two astronauts around the moon in May 2024.

The third SLS launch, set to happen in 2025, will be crewed by up to four astronauts, and this time, two crew members will travel to the moon’s surface — returning humans to the moon for the first time in more than 50 years.

Update, 8/30/22, 9:00 a.m. ET: This article was updated to include NASA’s livestream of the SLS launch.

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