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Cultivating a Planetary Garden: How Long Does It Take? According to the most popular theory of planet formation, planets are akin to redwood trees, growing in size very gradually. Rocky planets like Earth develop over millions of years, followed by gas giants like Jupiter, which build upon rocky cores. But new evidence from NASA's Spitzer Space Telescope suggests that some gas giants may sprout in less than one million years, more like planetary wildflowers than trees.
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