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What is the Sun?

The Sun is actually a Star. Stars are massive nuclear reactors that generator energy from their core.

How far away is the Sun?

It is 149.6 million km away from the Earth. It is the heat and light from the Sun that is responsible for life on Earth. The huge gravitational pull of the Sun keeps the planets of our Solar System orbiting around it.

How big is the Sun?

The Sun is roughly 1.4 million kilometers wide. To give you a better idea of how big that is, 100 Earth's can be spread across the width of the sun and one million Earth's could fit into it!

How old is the Sun?

The Sun is about 4 1/2 billion years old.

How long will the sun live?

The Sun will remain, more or less the way it is now, for about another 5 billion years. After that, it will exhaust the hydrogen it currently burns and will enter a new phase of existence. During this phase the Sun will begin burning helium and will expand to about 100 times its current size and become what is called a red giant. Once it runs out of helium it will collapse into a much smaller object called a white dwarf.

How hot is the Sun?

The center of the Sun is about 10 million degrees. The surface of the Sun, called the photosphere, is at a temperature of about 5800 Kelvin. Sunspots are cool regions and they are 3800 K.

What is the Sun made up of?

The Sun is, at present, about 75% hydrogen and 25% helium.

What are Shooting Stars?

Shooting Stars are not real Stars at all! They are meteors made up of particles of rock and dust that shine brightly as they burn up in the Earth's atmosphere.

What is a Galaxy?

A Galaxy is an enormous group of stars held together by gravity. There are three different shapes of Galaxies, spiral, elliptical and irregular. We live in a Galaxy called the Milky Way and it is a spiral shape. There may be 100 billion Galaxies in the universe!

What is an Eclipse?

Eclipses happen for a brief period when the Moon, Earth and Sun are in line. A lunar eclipse happens when the Earth lies between the Moon and Sun, blocking off the light to the moon so that the Moon seems to vanish. A solar eclipse happens when the Moon blocks the Sun's light from the Earth so that the Sun seems to disappear.

What are the planets orbiting the Sun?

The first four planets are known as the Inner Planets. The remaining five are known as the Outer Planets.

Planet Diameter Length Of Year No. Of Moons

Mercury
Venus
Earth
Mars
Jupiter
Saturn
Uranus
Neptune
Pluto
4878km
12,103km
12,756km
6794km
142,800km
120,000km
52,400km
49,400km
1100km
88 Earth days
225 Earth days
365 Earth days
687 Earth days
11.9 Earth days
29.5 Earth days
84.0 Earth days
164.8 Earth days
248.5 Earth days
0
0
1
2
16
18
15
8
1

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