Saturn is not the only planet to have rings, but none are as spectacular or as complex as Saturn's. Like fellow gas giant Jupiter, Saturn is a massive ball made mostly of hydrogen and helium. But if this is the case, that ratio must be notably different than Earth's: The TRAPPIST-1 planets are about 8% less dense than they would be if they had the same makeup as our home planet. Saturn is the sixth planet from the Sun and the second-largest planet in our solar system. That could mean they all contain about the same ratio of materials thought to compose most rocky planets, like iron, oxygen, magnesium, and silicon. They are likely made of similar stuff, but they are different than Earth. The study pinned down the density of each planet more precisely, making TRAPPIST-1 the most thoroughly known planetary system apart from our own.Ī 2021 study revealed more about TRAPPIST-1 planets. In February 2018, closer study of the seven planets suggested that some could harbor far more water than the oceans of Earth, in the form of atmospheric water vapor for the planets closest to their star, liquid water for others, and ice for those farthest away. There is the possibility that future study of this unique planetary system could reveal conditions suitable for life. This system of seven rocky worlds–all of them with the potential for water on their surface – is an exciting discovery in the search for life on other worlds. In a press release on February 22, 2017, NASA announced the discovery of the most Earth-sized planets found in the habitable zone of a single star, called TRAPPIST-1. An analysis of TRAPPIST-1 b, the innermost planet, revealed its dayside temperature and found little evidence of an atmosphere. The best available theory of planet formation is the nebular hypothesis. In March 2023, the first science from the Webb telescope was released. The eight planets of the Solar System with size to scale (up to down, left to right): Saturn, Jupiter, Uranus, Neptune (outer planets), Earth, Venus, Mars, and Mercury (inner planets) A planet is a large, rounded astronomical body that is neither a star nor its remnant. ![]() These two planets raise great challenges to planetary scientists in terms of their formation history, evolution path, internal structure and composition, atmospheric dynamics and many other areas. ![]() We've looked at the seven rocky exoplanets orbiting the TRAPPIST-1 star with ground and space telescopes like Spitzer, Kepler, Hubble, and, now, the James Webb Space Telescope. Uranus and Neptune are the outermost planets in the Solar System. The most studied planetary system, aside from our own solar system, lies about 40 light-years away.
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