Question

5
Answer the following questions.
a. Why is the sun called a star?
b. What is a galaxy?
c. How was the universe formed?
d. What is our solar system made up of?
e. Why do planets shine?​

Answer 1

Answer:

1) Sun- the star of our solar system is a star because it produces energy by the fusion reaction of Helium turning into Hydrogen.

2) A galaxy is a gravitationally bound system of stars, stellar remnants, interstellar gas, dust, and dark matter. The word galaxy is derived from the Greek galaxias, literally "milky", a reference to the Milky Way.

3) Our universe began with an explosion of space itself - the Big Bang. Starting from extremely high density and temperature, space expanded, the universe cooled, and the simplest elements formed. Gravity gradually drew matter together to form the first stars and the first galaxies.

4) Our solar system is made up of a star—the Sun—eight planets, 146 moons, a bunch of comets, asteroids and space rocks, ice, and several dwarf planets, such as Pluto.

5) Because planets do not have nuclear fusion, they do not produce their own light. Instead, they shine with light reflected from a star. When we see planets in the night sky, such as Venus, the so-called "Evening Star," we're seeing reflected sunlight.

Explanation:

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Answer 2

a)Sun is a star because it emits its own light.

b) Galaxy is a big massive nebula with a lots of stars and planets revolving around those stars.

c)There is a theory called the big bang theory.it is said that the universe was first a drawf and one day it exploded and formed a massive nebula.

This is how the universe was formed,but no one exactly knows the theory.

d)our solar system is made of 8 planets,146 moons,comets, asteroids,rocks,drawf planets and a star called sun in the middle.

planets shine because of the sun's light reflecting on them...........

Explanation:

Hope it helps........