An artist's impression shows the smallest and fastest-orbiting exoplanet known, CoRoT-7b, which was the first known exoplanet with a density similar to that of Earth. HO / AFP - Getty ImagesFrom MSNBC/Space:
Among the discoveries: most massive black hole and water on the moon.
This year provided plenty of cosmic eye-openers for astronomers and casual stargazers alike.
Neighborhood planets such as Mercury and Jupiter received makeovers in both a scientific and literal sense. The discovery of water on the moon and Mars provided clues to the past, not to mention hints for the future of space exploration. A class of newly-detected "Super-Earth" planets around alien stars may ultimately prove more habitable than Earth. And a growing fleet of existing, new and revived space telescopes promises another stellar year ahead.
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