After five days of work on the Hubble telescope, astronauts say it's working better than ever!
Repairs have now finished to the 19-year-old telescope, and scientists reckon it will now be able to see even further into space.
The Atlantis Shuttle crew are now ready to release the Hubble back into space.
It's the last time that humans will be able to reach Hubble because the shuttle is going into retirement next year.
Astronauts have been working really hard on the Hubble.
On Saturday, they spent eight hours on a spacewalk to fit six replacement gyroscopes. They allow Nasa to aim Hubble where it wants it to look.
The astronauts also fitted some new batteries, as although Hubble is solar powered, some weren't recharging.
One astronaut, Mike Massimino, said after the mission: "At times, I felt like I was wrestling a bear."
Hubble Space Telescope
Launched 600km above the Earth in 1990
15.9m long; 4.2m wide; weighs 11,110kg
Made more than 93,000 trips around our planet
Looked at more than 24,000 things in space
The telescope has been in orbit for 20 years, helping us learn about the way the Universe works by showing far-off stars and fantastic sights.
Astronauts blasted into space last Wednesday for their 11-day mission.
The mission is considered to be pretty risky by space experts as the telescope is a long way from the International Space Station.
Rescue shuttle ready
That means if something goes wrong, the astronauts can't go to the space station for help.
But space agency Nasa have got another shuttle - the Endeavour - ready to blast off to rescue the crew if required.