Enceladus, one of Saturn's moons.  The Cassini spacecraft captured an image of plumes originating from the south pole of the icy moon with a very clear signature of small ice particles. There is possible evidence of Yellowstone-like geysers fed by reservoirs of liquid water.

Enceladus, one of Saturn's moons. The Cassini spacecraft captured an image of plumes originating from the south pole of the icy moon with a very clear signature of small ice particles. There is possible evidence of Yellowstone-like geysers fed by reservoirs of liquid water.

Earth (left) and moon photographed from the Cassini spacecraft in orbit around Saturn on July 19, 2013.  This is only the third time ever that Earth has been imaged from the outer solar system.

Earth (left) and moon photographed from the Cassini spacecraft in orbit around Saturn on July 19, 2013. This is only the third time ever that Earth has been imaged from the outer solar system.

The galaxy Centaurus A is pictured in a new image from the European Southern Observatory. With a total exposure time of more than 50 hours this is probably the deepest view of this peculiar and spectacular object ever created. The image was produced by the Wide Field Imager of the MPG/ESO 2.2-metre telescope at ESO’s La Silla Observatory in Chile.

The galaxy Centaurus A is pictured in a new image from the European Southern Observatory. With a total exposure time of more than 50 hours this is probably the deepest view of this peculiar and spectacular object ever created. The image was produced by the Wide Field Imager of the MPG/ESO 2.2-metre telescope at ESO’s La Silla Observatory in Chile.

Valles Marineris: The Grand Canyon of Mars. It is the biggest, deepest canyon in the solar system.

Valles Marineris: The Grand Canyon of Mars. It is the biggest, deepest canyon in the solar system.

A colour image released by NASA shows Mount Sharp in the background taken by the 34-millimeter Mast Camera on Nasa Curiosity rover on Mars.

A colour image released by NASA shows Mount Sharp in the background taken by the 34-millimeter Mast Camera on Nasa Curiosity rover on Mars.

2011 Feb. 27 - Saturn's Hyperion: A Moon with Odd Craters. The robot Cassini spacecraft now orbiting Saturn swooped past the sponge-textured moon in 2005 and 2010 and took images. This image from the 2005 pass, shown in false color, shows a world strewn with strange craters and a generally odd surface. Hyperion is about 250 kilometers across, rotates chaotically, and has a density so low that it might house a vast system of caverns inside.

2011 Feb. 27 - Saturn's Hyperion: A Moon with Odd Craters. The robot Cassini spacecraft now orbiting Saturn swooped past the sponge-textured moon in 2005 and 2010 and took images. This image from the 2005 pass, shown in false color, shows a world strewn with strange craters and a generally odd surface. Hyperion is about 250 kilometers across, rotates chaotically, and has a density so low that it might house a vast system of caverns inside.

An enormous cloud of hot gas is surrounding two merging spiral galaxies. This gas reservoir contains the mass of 10 billion Suns, spans 300,000 light years, and radiates at more 7 million degrees. This giant gas cloud, which scientists call a "halo," is located in the system called NGC 6240. - Credit: X-ray (NASA/CXC/SAO/E.Nardini et al); Optical (NASA/STScI)

An enormous cloud of hot gas is surrounding two merging spiral galaxies. This gas reservoir contains the mass of 10 billion Suns, spans 300,000 light years, and radiates at more 7 million degrees. This giant gas cloud, which scientists call a "halo," is located in the system called NGC 6240. - Credit: X-ray (NASA/CXC/SAO/E.Nardini et al); Optical (NASA/STScI)

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