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All planets listed are smaller than Earth and Venus, ... [12] Mars: 0.5325 Shown for comparison ... Radius is in the range of 1.2 – 120 km. ...
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.
According to the IAU's explicit count, there are eight planets in the Solar System; four terrestrial planets (Mercury, Venus, Earth, and Mars) and four giant planets, which can be divided further into two gas giants (Jupiter and Saturn) and two ice giants (Uranus and Neptune). When excluding the Sun, the four giant planets account for more than ...
12.000 Mm – diameter of Sirius B, a white dwarf [166] 12.104 Mm – diameter of Venus; 12.742 Mm – diameter of Earth; 12.900 Mm – minimum distance of the meteoroid 2004 FU 162 from the centre of Earth on 31 March 2004, closest on record; 14.000 Mm – smallest diameter of Jupiter's Great Red Spot; 19.000 Mm – separation between Pluto ...
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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 ...
Conversely, measurements of the smaller body's orbit only provide information on the product, μ, not G and M separately. The gravitational constant, G , is difficult to measure with high accuracy, [ 12 ] while orbits, at least in the solar system, can be measured with great precision and used to determine μ with similar precision.
Craters larger than roughly 50 km are named for deceased scientists and writers and others who have contributed to the study of Mars. Smaller craters are named for towns and villages of the world with populations of less than 100,000. Large valleys are named for the word "Mars" or "star" in various languages; smaller valleys are named for rivers.