C. Explain the following terms :
1. Planet
2. Galaxy
3. Star
4. Comet
5. Satellite
Answers
Explanation:
planet : A planet is a very large round object in the space that moves around the or another star.
Galaxy : A galaxy is a collection of stars and planets that are held together by gravity. In a galaxy, the celestial bodies rotate around a central object. The earth's galaxy is known as the Milky Way. Our solar system, made up of the sun and the planets that encircle it, is a tiny part of that galaxy.
Star : A star is a fixed luminous point in the night sky which is a large, remote incandescent body like the sun.
Comet : Comets are a celestial objects consisting of a nucleus of ice and dust and when near the sun, a 'tail' of gas and dust particles pointing away from the sun.
Satellite : A satellite is an artificial body placed in orbit round the earth or moon or another planet in order to collect information or for communication.
1.Planet✍✍✍
A planet is a large object such as Venus or Earth that orbits a star. Planets are smaller than stars, and they do not produce light. ... Planets are shaped like a slightly squashed ball (called a spheroid). Objects that orbit planets are called satellites.
2.Galaxy✍✍✍
A galaxy is a huge collection of gas, dust, and billions of stars and their solar systems, all held together by gravity. ... It's a small part of the Milky Way Galaxy. A galaxy is a huge collection of gas, dust, and billions of stars and their solar systems. A galaxy is held together by gravity.
3.Star✍✍✍
A star is a luminous ball of gas, mostly hydrogen and helium, held together by its own gravity. Nuclear fusion reactions in its core support the star against gravity and produce photons and heat, as well as small amounts of heavier elements. The Sun is the closest star to Earth.
4.Comet✍✍✍
A comet is an icy, small Solar System body that, when passing close to the Sun, warms and begins to release gases, a process that is called outgassing. This produces a visible atmosphere or coma, and sometimes also a tail.
5.Satellite✍✍✍
A satellite orbits Earth when its speed is balanced by the pull of Earth's gravity. Without this balance, the satellite would fly in a straight line off into space or fall back to Earth. Satellites orbit Earth at different heights, different speeds and along different paths.
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