Space shuttles trade places, Hubble shows a cosmic gem, a crater gets its day in...

Space shuttles trade places, Hubble shows a cosmic gem, a crater gets its day in the sun, and more in the week's best space pictures.


Space Pictures This Week: Shuttle Swap, Hubble's Jewels -- National Geographic
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Dense, bright knots of gas shine like jewels in a recently released Hubble Space Telescope picture of the Necklace nebula, a planetary nebula about 15,000 light-years away. Discovered in 2005, the cosmic adornment is actually a cloud of gas and dust created by the death of a sunlike star.

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