Labels: text | screenshot | machine | electronics | camera OCR: RE- MARS AND EARTH: A COMPARATIVE HISTORY THE SEARCH FOR LIFE Formation REA Earth, Mars, and the other planets of our solar system came into being about 4.6 billion years ago within the primitive nebula. In the disk surrounding the young Sun, stellar dust collected, spinning around small central bodies. The colliding particles formed larger and larger particles, and eventually aggregated. As their mass increased, they attracted even more particles. We can assume that Earth and Mars, like Venus, Mercury, the Moon, and the other bodies in the solar system, all had AN oxygen composition at this time. All had a high level of oxygen. Therefore, some time after they formed, both Mars and the Earth were silicate spheres composed of diverse metals and surrounded by a gaseous envelope of hydrogen and helium. Soon afterward, the lightest gases in their primitive atmospheres escaped into space. Development of life on Earth Both planets were then exposed to the interstellar vacuum 000 and subjected to the impact of the many asteroids whose paths crossed the solar system. This bombardment was particularly intense four billion years ago. EAR MARS BETAT
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