Stages in the birth and death of the Solar System. (1) A globule forms from a giant molecular cloud. (2) The globule contracts gravitationally,forming a protoplanetary disc called the solar nebula. A bipolar outflow of charged particles may also be visible. (3) The stars and the planets form within the solar nebula. (4) In about 6 billon years from now,the Sun expands into a red giant,swallowing the inner two planets,and possibly Earth. (5) 200 million years after that,the Sun sheds its outer layers to form a planetary nebula. (6) A few tens of thousands of years later,the planetary nebula dissipates,leaving behind the remaining planets orbiting the Sun's original,exposed core - now a white dwarf | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Garlick, Mark |
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