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. Jupiter and Saturn are both gas giants, while the outermost planets, Uranus and Neptune, are ice giants. That could mean they all contain about the same ratio of materials thought to compose most rocky planets, like iron, oxygen, magnesium, and silicon. The four inner planets, Mercury, Venus, Earth, and Mars, are all rocky worlds. 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. For example, one way to explain why the TRAPPIST-1 planets are less dense is that they have a similar composition to Earth, but with a lower percentage of ironabout 21 compared to Earths 32. (Image credit: dottedhippo via Getty Images. Learning about both the masses (via radial velocity measurements) and about the atmospheres of these planets will inform our understanding of their bulk compositions and structures. ![]() An analysis of TRAPPIST-1 b, the innermost planet, revealed its dayside temperature and found little evidence of an atmosphere. The four gas giants of our solar system are Jupiter, Saturn, Uranus and Neptune are collectively known as Jovian planets, meaning Jupiter-like. In March 2023, the first science from the Webb telescope was released. 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. The most studied planetary system, aside from our own solar system, lies about 40 light-years away.
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