"The self-same atoms which, chaotically dispersed, made the nebula, now, jammed and temporarily caught in peculiar positions, form our brains; and the 'evolution' of brains, if understood, would be simply the account of how the atoms came to be so caught and jammed." -William James
Up in the heavens, there are planets, stars, and galaxies all clearly visible in the night sky.
Image credit: Dan & Cindy Duriscoe, FDSC, Lowell Obs., USNO.
But those stars weren't always there, and they won't be there forever. The other class of object in the night sky -- the nebulae -- come in two types. On…
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