Question

Q.1 Define the following terms :
1. Celestial bodies
2. Universe
3. Nebula
4. Galaxy​

Answer 1

Answer:

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Answer 2

Answer:

1:-: an aggregation of matter in the universe that constitutes a unit (as a planet, nebula) for astronomical study.

2.:-The Universe is everything we can touch, feel, sense, measure or detect. It includes living things, planets, stars, galaxies, dust clouds, light, and even time. ... The Universe contains billions of galaxies, each containing millions or billions of stars. The space between the stars and galaxies is largely empty

3:-nebula:-a cloud of gas and dust in outer space, visible in the night sky either as an indistinct bright patch or as a dark silhouette against other luminous matter.

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