Question

What is Astronomy , planets and stars

Answer 1

Answer:

Astronomy is a natural science that studies celestial objects and phenomena which uses maths physics and chemistry in order to explain their origin and evolution. Planets and stars are linked with astronomy.

Planets are large natural objects that orbit, or travel around, stars.  A planet must do three things: it must orbit a star, it must be big enough to have enough gravity to force a spherical shape, and it must be big enough that its gravity cleared away any objects of a similar size near its orbit.

A star is an astronomical object consisting of a luminous spheroid of plasma held together by its own gravity. Represents the most fundamental building blocks of galaxies. Stars form within amorphous clouds of gas and dust called nebulae.

Answer 2

Answer:

Astronomy (from Greek: ἀστρονομία) is a natural science that studies celestial objects and phenomena. It uses mathematics, physics, and chemistry in order to explain their origin and evolution. Objects of interest include planets, moons, stars, nebulae, galaxies, and comets.

A planet is an astronomical body orbiting a star or stellar remnant that is massive enough to be rounded by its own gravity, is not massive enough to cause thermonuclear fusion, and has cleared its neighbouring region of planetesimals.

A star is an astronomical object consisting of a luminous spheroid of plasma held together by its own gravity. The nearest star to Earth is the Sun.

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