From FOX News:
Early in Earth's history, our solar system was a much different place.
When the sun was very young, it was faint and provided little heat for the Earth. However, even in its chilly beginnings, the surface of the Earth was ice-free.
For years, scientists have proposed theories for this "faint young sun problem."
Most of these theories are based on the idea that the early Earth must have had extremely high amounts of greenhouse gases like carbon dioxide (CO2) in the atmosphere in order to warm the planet.
According to a team of German scientists, geological evidence of atmospheric CO2 seems to indicate that levels were "far too low to keep the surface from freezing."
However, their new study may provide a new answer to the problem.
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