Question

Maswer the following questions briefly
1. What are called heavenly bodies?
Deline constellation
3. What are stars?
What are planets? Also give their names.
5. What do you mean by Lunar month
Answer the following questions in detail:
1. How did the universe start?
2. Why do we consider the Earth a unique planet?
3. Differentiate between a star and a planet.
4. Define: i. Asteroids
ii. Meteors
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Answer 1

Answer:

Explanation:- 1 Natural objects visible in the sky are called heavenly bodies. - Planets, stars, moons, comets, meteors and asteroids, are some of the heavenly bodies in space

2 group of stars forming a recognizable pattern that is traditionally named after its apparent form or identified with a mythological figure.

3.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.

a celestial body moving in an elliptical orbit round a star. example: earth jupiter, mars saturn

1.According to the standard Big Bang model, the universe was born during a period of inflation that began about 13.8 billion years ago. Like a rapidly expanding balloon, it swelled from a size smaller than an electron to nearly its current size within a tiny fraction of a second.

2To enable life, this most special of attributes, planet Earth has a number of ideal features. It is unique among planets in our solar system for having water in its liquid form at the surface, in an amount conducive to life evolving

3The main difference between stars and planets is that stars have high temperatures compared to planets. Stars undergo nuclear reactions—they burn hydrogen in their cores, releasing massive amounts of energy. In order to be hot enough for these reactions to take place, stars need to be extremely big. They must have a mass of at least 75 times that of Jupiter, the largest planet in the Solar System. Because they radiate energy, stars are very bright objects. Planets do not generate their own energy through nuclear reactions. They reflect some of the radiation coming from their parent star.

4An asteroid is a small rocky object that orbits the Sun. ... An asteroid is a small rocky object that orbits the Sun. A meteor is what happens when a small piece of an asteroid or comet, called a meteoroid, burns up upon entering Earth's atmosphere.

Answer 2

$\huge\underline\mathfrak\red{Hello!}$

Q-1:-

1. Stars,moons, planets,etc are known as heavenly bodies.
2. Constellation means group of stars and makes a special design.
3. Stars are luminous bodies which are made of gases. They don't have any fixed shape.
4. Lunar month is the month where days are based on the movement of moon.

Q-2:-

1. According to scientists universe started about 13.8 billion years ago. It rapidly started to extend and started to swell up and then there was a visport known as big bang theory.
2. Earth is considered as unique planet because it has life,air,water, soil and many more things. earth is the only planet where life exists.
3. Star:-

• Luminous body
• No movement
• they are Not solid
• Have no sound

1. Planets:-

• Non-luminous
• Do rotation and revolution
• They are solid
• Plants have sound

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