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Page last updated at 15:03 GMT, Monday, 9 March 2009
In pictures: Hubble space photos

Three galaxies - NGC 7173, middle left, NCG 7174,middle right, and NGC 7176, lower right - are part of the Hickson Compact Group 90

In a new image released by US space agency Nasa, three galaxies are locked in a gravitational tug-of-war. It may mean one will be destroyed. The galaxies are named after astronomer Paul Hickson.

Planetary Nebula NGC 2818

This photo of a star, released last month, shows the southern constellation of Pyxis (the Compass). It contains the outer layers of the star that were expelled into space 10,000 light-years from Earth.

The Crab Nebula

This image of the Crab Nebula is one of the largest ever produced with the Hubble Space Telescope, the Earth-orbiting observatory. It's one of the most intricately structured objects ever observed.

Antennae galaxies

This image from 2006 shows two galaxies smashing together. Billions of stars are being created, mostly in groups and clusters of stars. The galaxies started to fuse together about 500 million years ago.

Part of the constellation Scorpius

This image from December 2006 shows one of the biggest and heaviest stars in the Milky Way. Until recently scientists had thought it was just one star but now think it may be two or even three.

Star cluster Pismis 24

This is another shot of the star or stars in the Milky Way. It sits in the constellation Scorpius and you can see it in the southern hemisphere near the centre of the Milky Way.

The Pinwheel Galaxy

This series of images was released three years ago and shows a galaxy far, far away called Messier 101. It's a giant disk of stars, dust and gas and is 170,000 light-years across.

Spiral galaxy Messier 101

The same galaxy, Messier 101, is shown using different coloured filters. It's possible to see new stars forming (shown in yellow). The image was taken in February this year.

Spiral Galaxy NGC-4921

This galaxy, called NGC-4921, is about 320 million light-years away from Earth. The image, taken in February, was created from a total of 80 separate pictures through yellow and near-infrared filters.

Jupiter's moon Ganymede

Jupiter's moon Ganymede is shown just before it ducks behind the giant planet. Ganymede completes an orbit around Jupiter every seven days and is the largest moon in our solar system.

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