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The radii of these objects range over three orders of magnitude, from planetary-mass objects like dwarf planets and some moons to the planets and the Sun. This list does not include small Solar System bodies , but it does include a sample of possible planetary-mass objects whose shapes have yet to be determined.
The portion of the mass that is located at radii r > r 0 exerts no net gravitational force at the radius r 0 from the center. That is, the individual gravitational forces exerted on a point at radius r 0 by the elements of the mass outside the radius r 0 cancel each other.
An object that orbits the Sun more closely than Earth would typically have a shorter orbital period than Earth, but that ignores the effect of Earth's gravitational pull. If the object is directly between Earth and the Sun, then Earth's gravity counteracts some of the Sun's pull on the object, increasing the object's orbital period. The closer ...
Large-scale gravity anomalies can be detected from space, as a by-product of satellite gravity missions, e.g., GOCE. These satellite missions aim at the recovery of a detailed gravity field model of the Earth, typically presented in the form of a spherical-harmonic expansion of the Earth's gravitational potential, but alternative presentations ...
Trojans are bodies located within another body's gravitationally stable Lagrange points: L 4, 60° ahead in its orbit, or L 5, 60° behind in its orbit. [160] Every planet except Mercury and Saturn is known to possess at least 1 trojan. [161] [162] [163] The Jupiter trojan population is roughly equal to that of the asteroid belt. [164]
The location of the Great Attractor is shown following the long blue arrow at bottom right. Hubble Space Telescope image showing part of the Norma cluster, including ESO 137-002 The Great Attractor is a region of gravitational attraction in intergalactic space and the apparent central gravitational point of the Laniakea Supercluster of galaxies ...
The blue lines are gravitational waves, ripples in time and space, which is how astronomers detected the merger, and orange and red areas indicate parts of the neutron star being stripped away.
For any two bodies in which one body orbits around the other, such as a star/planet or planet/moon system, there are five such points, denoted L 1 through L 5. For instance, the Earth–Moon L 1 point lies on a line between the two, where gravitational forces between them exactly balance with the centrifugal force of an object placed in orbit ...