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Last Updated: Friday May 15 2009 06:26 GMT

First Hubble spacewalk is success

Astronauts set out on first spacewalk

Two astronauts have completed the first of five planned spacewalks to repair and revamp the Hubble Space Telescope.

They spent almost seven hours floating hundreds of miles above Earth to fit a new camera which will help Hubble to see deeper into space than ever before.

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 for their 11-day mission on Wednesday.

Other work completed on the space walk included replacing a broken computer and fixing a mechanism that will let a robotic spacecraft capture the telescope in the future, so it's not left floating around in space forever.

Hubble Space Telescope
Hubble servicing (Nasa)
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 mission is considered to be pretty risky by space experts as the telescope is a long way from the International Space Station.

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.

If everything goes to plan, the updated telescope will be 90 times more powerful than it originally was and should last until at least 2014.