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Others 

Brown dwarf: a celestial object intermediate in size between a giant planet and a small star, believed to emit mainly infrared radiation.


White dwarf: A white dwarf, also called a degenerate dwarf, is a stellar core remnant composed mostly of electron-degenerate matter. A white dwarf is very dense: its mass is comparable to that of the Sun, while its volume is comparable to that of Earth.

Galaxy: a system of millions or billions of stars, together with gas and dust, held together by gravitational attraction.


Local group: Local Group, in astronomy, the group of more than 20 galaxies to which the Milky Way Galaxy belongs.


Black hole: A black hole is a region of space-time where gravity is so strong that nothing—no particles or even electromagnetic radiation such as light—can escape from it.


Moon: The Moon is an astronomical body orbiting Earth as its only natural satellite.


Satellite: an artificial body placed in orbit round the earth or moon or another planet in order to collect information or for communication.


Super nova: a star that suddenly increases greatly in brightness because of a catastrophic explosion that ejects most of its mass.


Asteroid: Asteroids are minor planets, especially of the inner Solar System. Larger asteroids have also been called planetoids.

Dwarf Planet: A dwarf planet is a planetary-mass object that does not dominate its region of space and is not a satellite.

Solar System: The Solar System is the gravitationally bound system of the Sun and the objects that orbit it, either directly or indirectly. Of the objects that orbit the Sun directly, the largest are the eight planets, with the remainder being smaller objects, the dwarf planets and small Solar System bodies.


Galilean moons: The Galilean moons are the four largest moons of Jupiter—Io, Europa, Ganymede, and Calisto. They were first seen by Galileo Galilei in December 1609 or January 1610, and recognized by him as satellites of Jupiter in March 1610. They were the first objects found to orbit a planet other than the Earth.


Mercury: Mercury is the smallest and innermost planet in the Solar System. Its orbit around the Sun takes 87.97 days, the shortest of all the planets in the Solar System. It is named after the Roman deity Mercury, the messenger of the gods.


Venus: Venus is the second planet from the Sun. It is named after the Roman goddess of love and beauty. As the second-brightest natural object in the night sky after the Moon, Venus can cast shadows and, rarely, is visible to the naked eye in broad daylight.
Earth: Home!


Mars: Mars is the fourth planet from the Sun and the second-smallest planet in the Solar System after Mercury. In English, Mars carries the name of the Roman god of war and is often referred to as the 'Red Planet'.


Asteroid belt: The asteroid belt is a torus-shaped region in the Solar System, located roughly between the orbits of the planets Jupiter and Mars, that is occupied by a great many solid, irregularly shaped bodies, of many sizes but much smaller than planets, called asteroids or minor planets.


Jupiter: Jupiter is the fifth planet from the Sun and the largest in the Solar System. It is a gas giant with a mass one-thousandth that of the Sun, but two-and-a-half times that of all the other planets in the Solar System combined.


Saturn: Saturn is the sixth planet from the Sun and the second-largest in the Solar System, after Jupiter. It is a gas giant with an average radius of about nine times that of Earth. It only has one-eighth the average density of Earth; however, with its larger volume, Saturn is over 95 times more massive.


Uranus: Uranus is the seventh planet from the Sun. It has the third-largest planetary radius and fourth-largest planetary mass in the Solar System. Uranus is similar in composition to Neptune, and both have bulk chemical compositions which differ from that of the larger gas giants Jupiter and Saturn.


Neptune: Neptune is the eighth and farthest known planet from the Sun in the Solar System. In the Solar System, it is the fourth-largest planet by diameter, the third-most-massive planet, and the densest giant planet. Neptune is 17 times the mass of Earth, slightly more massive than its near-twin Uranus.


Pluto: Pluto is an icy dwarf planet in the Kuiper belt, a ring of bodies beyond the orbit of Neptune. It was the first and the largest Kuiper belt object to be discovered. Pluto was discovered by Clyde Tombaugh in 1930 and declared to be the ninth planet from the Sun, however the celestial body was demoted later on to a dwarf planet due to its tiny size. Pluto’s diameter is smaller than the moon’s.


Kuiper Belt: The Kuiper belt, occasionally called the Edgeworth–Kuiper belt, is a circumstellar disc in the outer Solar System, extending from the orbit of Neptune to approximately 50 AU from the Sun. It is similar to the asteroid belt, but is far larger—20 times as wide and 20 to 200 times as massive.


Oort’s cloud: The Oort cloud, named after the Dutch astronomer Jan Oort, sometimes called the Öpik–Oort cloud, is a theoretical cloud of predominantly icy planetesimals proposed to surround the Sun at distances ranging from 2,000 to 200,000 au

Nebula: A nebula is an interstellar cloud of dust, hydrogen, helium and other ionized gases. They are often produced as remnants of dying stars.


 

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