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Through extremely high precision measurements of a pulsar orbiting a white dwarf star, astronomers have found that the gravitational constant, which dictates the force of gravity, is "reassuringly constant" throughout the universe.
Here's some bling on an astronomical scale: A Jupiter-mass planet orbiting the newly discovered pulsar PSR is likely one gigantic diamond. The planet's ultra-high pressure has caused the carbon within it to crystallize into diamond, researchers
The Planet From Hell - Gliese 581 c. This planet is stuck in a state of tidal locking with its sun - as our moon is with earth. Which means one side would melt your face off while the other would freeze it instantly.