A new study questions the theories on how Mars and Earth were formed and says planets shared a third material that is now lost. Exactly 4.6 billion years ago our solar system was unrecognizable. The Sun, a young star, was orbited by a disk of dust and gases. No planets yet existed but this dust material would eventually form them.
Today, the inner Solar System contains four rocky planets, Mercury, Venus, Earth, and Mars. The outer solar system includes the giants, Jupiter, Saturn, Uranus, and
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