Earth-sized planets that host life should be far easier to
find around parent stars that are white dwarfs, the ultimate
incarnations of stars like the sun.
Before it collided with Earth, the Chelyabinsk space rock was
a 10,000 ton meteoroid -- now astronomers think they know where it came
from.
Stars discovered in the Milky Way's halo could be what
remains of smaller galaxies that were eaten to form the our galaxy.
A recently discovered comet will make an uncomfortably-close
planetary flyby next year -- but this time it's not Earth that's in the
cosmic crosshairs.
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