Unique in the solar system, contains water in all 3 states, life, atmospheric composition, internal structure and plate tectonics, and constantly changing
The formation of the universe 10-15 billion years ago, began as an indefinitely small point that exploded outward
thermonuclear fusion reactors, born from the remains of past stars, through process of fusion; lighter elements are combined under great heat and pressure to form heavier elements
The remains of a past star +/- planets
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