![]() Small particles drew together, bound by the force of gravity, into larger particles, according to the core accretion model. With the rise of the sun, the remaining material began to clump together. Gravity collapsed the material in on itself as it began to spin, forming the sun in the center of the nebula. The third, the disk instability method, may account for the creation of giant planets.Īpproximately 4.6 billion years ago, the solar system was a cloud of dust and gas known as a solar nebula. ![]() The second, pebble accretion, could allow planets to quickly form from the tiniest materials. The first and most widely accepted model, core accretion, works well with the formation of the rocky terrestrial planets but has problems with giant planets. Scientists have developed three different models to explain how planets in and out of the solar system may have formed. Among the planets, Jupiter likely formed first, perhaps as soon as a million years into the solar system's life, scientists have argued (opens in new tab). This material formed a massive disk around the baby star, which surrounded it for about 100 million years - an eyeblink in astronomical terms.ĭuring that time, planets and moons formed out of the disk. The planets, moons, asteroids and everything else in the solar system formed from the small fraction of material in the region that wasn't incorporated in the young sun. Scientists have applied what they've seen in other systems to our own star. Although gas and dust shroud young stars in visible wavelengths, infrared telescopes have probed many clouds in the Milky Way galaxy to study the environment of other newborn stars.
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