The Sun and its planets formed out of the solar nebula, around 4.6 billion years ago. But what was the delay between the Sun's formation and the planets? Astronomers have surveyed 78 protoplanetary disks in the Ophiuchus star-forming region and seen examples of every step in the planetary formation process. They found that the planets start forming much earlier than previously believed, when the disk is still filled with gas and dust, growing together with their host stars.
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