Earth
ScienceDaily (June 13, 2012) —Building a terrestrial planet requires raw materials that weren't
available in the early history of the universe. The Big Bang filled
space with hydrogen and helium. Chemical elements like silicon and
oxygen -- key components of rocks -- had to be cooked up over time by
stars. But how long did that take? How many of such heavy elements do
you need to form planets?
Previous studies have shown that...
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