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Moon Mimas and Ida, an asteroid with its own moon, Dactyl; Comet Lovejoy and Jupiter, a giant gas planet; The Sun; Sirius A with Sirius B, a white dwarf; the Crab Nebula, a remnant supernova; A black hole (artist concept); Vela Pulsar, a rotating neutron star; M80, a globular cluster, and the Pleiades, an open star cluster
The moons of the trans-Neptunian objects (other than Charon) have not been included, because they appear to follow the normal situation for TNOs rather than the moons of Saturn and Uranus, and become solid at a larger size (900–1000 km diameter, rather than 400 km as for the moons of Saturn and Uranus).
A comet is an icy, small Solar System body that warms and begins to release gases when passing close to the Sun, a process called outgassing.This produces an extended, gravitationally unbound atmosphere or coma surrounding the nucleus, and sometimes a tail of gas and dust gas blown out from the coma.
As space objects go, comets and meteors are not very big. While a planet like Earth is about 8,000 miles in diameter and a star like our Sun is about 865,000 miles across, the largest asteroid ...
C/2024 G3 (ATLAS) is a long-period comet, which will reach perihelion on 13 January 2025, at a distance of 0.09 AU from the Sun.It could become the brightest comet of 2025, [5] possibly exceeding apparent magnitude of −3.5.
Periodic comets usually have elongated elliptical orbits, and usually return to the vicinity of the Sun after a number of decades. The official names of non-periodic comets begin with a "C"; the names of periodic comets begin with "P" or a number followed by "P". Comets that have been lost or disappeared have names with a "D". Comets whose ...
As of 2022 there are no mission proposals to C/2014 UN 271, nor are there any upcoming missions that can be retargeted to the comet. The European Space Agency's upcoming Comet Interceptor mission, which will launch in 2029 and make a flyby of a long-period comet within Earth's orbit, will not be able to reach C/2014 UN 271 due to its large ...
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