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It was believed that the cutoff for round objects is somewhere between 100 km and 200 km in radius if they have a large amount of ice in their makeup; [1] however, later studies revealed that icy satellites as large as Iapetus (1,470 kilometers in diameter) are not in hydrostatic equilibrium at this time, [2] and a 2019 assessment suggests that ...
The size of the planets is not to scale. ... of the 1769 transit of Venus allowed astronomers to calculate the average Earth–Sun distance as 93,726,900 miles ...
The sizes are listed in units of Jupiter radii (R J, 71 492 km).This list is designed to include all planets that are larger than 1.6 times the size of Jupiter.Some well-known planets that are smaller than 1.6 R J (17.93 R 🜨 or 114 387.2 km) have been included for the sake of comparison.
Size comparison of the Sun, all the planets ... of the 1769 transit of Venus allowed astronomers to calculate the average Earth–Sun distance as 93,726,900 miles ...
This gives Pluto an escape velocity of 4,363.2 km per hour / 2,711.167 miles per hour (as compared to Earth's 40,270 km per hour / 25,020 miles per hour). Pluto is more than twice the diameter and a dozen times the mass of Ceres , the largest object in the asteroid belt .
Some of these planets orbit multiple stars at the same time. Certain planets are so close to their star that it takes only a handful of days to make one revolution, compared to the Earth which ...
The astronomical unit is typically used for stellar system scale distances, such as the size of a protostellar disk or the heliocentric distance of an asteroid, whereas other units are used for other distances in astronomy. The astronomical unit is too small to be convenient for interstellar distances, where the parsec and light-year are widely ...
44 423 miles The Jupiter radius or Jovian radius ( R J or R Jup ) has a value of 71,492 km (44,423 mi), or 11.2 Earth radii ( R 🜨 ) [ 2 ] (one Earth radius equals 0.08921 R J ). The Jupiter radius is a unit of length used in astronomy to describe the radii of gas giants and some exoplanets .