(AP) – FILE – This picture released by NASA on April 30, 1990 photo shows the Hubble Space Telescope held by the robot arm of the space shuttle Discovery some 380 miles above Earth as the telescope was being examined. (AP Photo/NASA)

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(AP) – FILE – This undated file photo made taken by the NASA Hubble Space Telescope shows the planet Mars. Two scientists are proposing we send volunteers to Mars and leave them there. They say the mission would mark the beginning of long-term human colonization of Mars, with numerous follow-up trips. The colleagues contend one-way missions could happen a lot quicker and cheaper, and it is essential to begin colonizing another planet as a hedge against a catastrophe that makes Earth uninhabitable. (AP Photo/NASA Hubble Space Telescope, File)

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(AFP/NASA/File) – This Hubble Space Telescope photo released in 2008 by NASA shows Abell 2390, a galaxy located 2.7 billion light-years from the Earth (redshift 0.23), in the constellation Pegasus. European astrophysicists said on Wednesday they could settle a mystery about how galaxies crank up in size, developing from proto-structures in the early Universe to the billion-star behemoths of today.(AFP/NASA/File)

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