Protoplanetary Disk
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Protoplanetary Disk

This illustration shows what the early Solar System looked like. It shows the young Sun, surrounded by a disc of dust and gas that would eventually condense to form the rocky and gaseous planets.

This illustration shows what the early Solar System looked like. It shows the young Sun, surrounded by a disc of dust and gas that would eventually condense to form the rocky and gaseous planets. These tumultuous and chaotic beginnings were marked by frequent and often cataclysmic meteoritic bombardments, by collisions among the protoplanets themselves or with the Sun, and by the probable ejection of protoplanets into interstellar space. The planets’ axes and directions of rotation are remnants of this tormented youth (the axis of Uranus is inclined by 97 degrees in relation to the Sun, and Venus rotates in the opposite direction to the seven other planets), not to mention the surfaces of the rocky planets (such as Mars and the Moon), which are riddled with craters.

The Sedna IV today
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