A Real Geezer
Photo Credit: NASA and H. Richer (U. British Columbia)

 
The oldest known planet is a primeval world 12.7 billion years old that formed more than 8 billion years before Earth and only 2 billion years after the Big Bang. The discovery suggested planets are very common in the universe and raised the prospect that life began far sooner than most scientists ever imagined.
Number 3: Shrinking Planet
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