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Least dense Kepler-51d: Kepler-51 [41] 0.0381 ± 0.0085 g/cm 3 [42] Next least dense are the hot Jupiter HAT-P-67b with about 0.044 g/cm 3 and the super-Neptune planet WASP-193b with 0.059 ± 0.014 g/cm 3. [43] A predicted highly evaporating planet was proposed to orbit the star FU Orionis north with a density of about 0.0042 g/cm 3. [d]
Uranus's mass is roughly 14.5 times that of Earth, making it the least massive of the giant planets. Its diameter is slightly larger than Neptune's at roughly four times that of Earth. A resulting density of 1.27 g/cm 3 makes Uranus the second least dense planet, after Saturn.
Many TNOs are often just assumed to have Pluto's density of 2.0 g/cm 3, but it is just as likely that they have a comet-like density of only 0.5 g/cm 3. [ 4 ] For example, if a TNO is incorrectly assumed to have a mass of 3.59 × 10 20 kg based on a radius of 350 km with a density of 2 g/cm 3 but is later discovered to have a radius of only 175 ...
The planet is located some 1,200 light-years away. A light-year is 5.8 trillion miles. It's the second-lightest exoplanet found so far based on its dimensions and mass, according to the researchers.
These planets were discovered in 2012 but their low densities were not discovered until 2014. [2] Another example is Kepler-87c. [1] One hypothesis is that a super-puff has continuous outflows of dust to the top of its atmosphere (for example, Gliese 3470 b), so the apparent surface is really dust at the top of the atmosphere. [2]
Of the Solar System's eight planets and its nine most likely dwarf planets, six planets and seven dwarf planets are known to be orbited by at least 300 natural satellites, or moons. At least 19 of them are large enough to be gravitationally rounded; of these, all are covered by a crust of ice except for Earth's Moon and Jupiter's Io. [1]
3.4 km (2.1 mi) Norgay Montes, Tombaugh Regio [72] 45 K [73] 35 K [73] Eris: 41 K [74] 30 K [74] Makemake: Haumea: The bodies included in this table are: (1) planemos; (2) major planets, dwarf planets, or moons of major or dwarf planets, or stars; (3) hydrostatically round so as to be able to provide a geodetic datum line.
Disintegrating planetesimal, likely one of several orbiting its star. Likely about one-tenth the mass of Ceres and ~200 km in radius. [4] Ceres: 0.0742 Shown for comparison: Pluto: 0.1863 Shown for comparison: Moon: 0.2725 Shown for comparison: Kepler-37b: 0.3098 +0.0059 −0.0076: Smallest known exoplanet. [5] [6] BD+05 4868 Ab ~0.314