Remembering STS-135: Marking 15 Years Since the Last Space Shuttle Mission Took Flight...

NASA / Bill Ingalls

It was on this day back in 2011 that Atlantis took off from Launch Complex 39A at NASA's Kennedy Space Center in Florida...beginning mission STS-135 to the International Space Station that lasted 12 days, 18 hours, 28 minutes and 50 seconds, and successfully concluded the 30-year space shuttle program. 15 years later, this anniversary is marked by humans finally venturing to the Moon once more on last April's Artemis 2 mission...and NASA gearing up for Artemis 3, an Earth-orbiting test flight that will pave the way for astronauts returning to the lunar surface on Artemis 4.

The time period between 2011 and 2020 (when SpaceX's Demo-2 flight resumed crewed launches from U.S. soil for the first time since STS-135) was marked by delays and uncertainty in America's human spaceflight program. But as of 2026, things are absolutely picking up with mankind moving ever so closer to maintaining a sustainable presence at the Moon, and finally, sending humanity on a much-awaited voyage to Mars. The future of space exploration has never been more promising than this!


NASA