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   ocr: LIFE CYCLE OF' THE SOLAR SYSTEM T HE 4.6billion SOLAR SYSTEM years ago. formed It started some life to sun form was planets. formed then Scientists fused have together as a cloud ofgas that contained tiny estimated that, if the sun continues to particles of dust and ice. When gravity give off energy at its present rate, the began to compress this cloud, the sun solar system should survive for at least was born. Debris left over after the another 5 billion years. Venus Earth Mars Orbits of the inner planets As the planets formed, they moved into the orbital paths that they. follow today. BIRTH ...