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Use of NASA logos, insignia and emblems is restricted per U.S. law 14 CFR 1221.; The NASA website hosts a large number of images from the Soviet/Russian space agency, and other non-American space agencies.
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 km with a density of 0.5 g/cm 3, its true mass would be only 1.12 × 10 19 kg.
Ceres makes up 40% of the estimated (2394 ± 5) × 10 18 kg mass of the asteroid belt, and it has 3 + 1 ⁄ 2 times the mass of the next asteroid, Vesta, but it has only 1 ⁄ 78 the mass of the Moon, and its surface gravity is 1 ⁄ 35 that of Earth (1 ⁄ 6 of the Moon's).
Ceres' shape is controlled mainly by gravity and spin, with only a 3% departure from hydrostatic equilibrium. Its best-fit shape is a triaxial ellipsoid with dimensions a = 483.1 km, b = 481.0, km and c = 445.9 km, with c being the north-south axis and a and b the semimajor and semiminor equatorial axes.
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The average thickness of the planet's crust is about 50 km, and it is no thicker than 125 kilometres (78 mi), [33] which is much thicker than Earth's crust which varies between 5 kilometres (3 mi) and 70 kilometres (43 mi). As a result, Mars' crust does not easily deform, as was shown by the recent radar map of the south polar ice cap which ...
An asteroid as big as a skyscraper will pass within 1.7 million miles of Earth on Friday. ... estimates the space rock is between 690 feet and 1,575 feet (210 meters and 480 meters) across ...
At 513 ± 3 km in diameter, [9] Pallas is slightly smaller than Vesta (525.4 ± 0.2 km [48]). The mass of Pallas is 79% ± 1% that of Vesta, 22% that of Ceres, and a quarter of one percent that of the Moon. Pallas is farther from Earth and has a much lower albedo than Vesta, and hence is dimmer as seen from Earth.