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Study Guide : Space

Learner Guide


Stars and Galaxies

The Universe is made of up billions of galaxies. Galaxies are

huge clusters of stars, containing millions of them, which are

held together by gravity. Our Sun is a star which looks very big

to us as it is so close to the Earth. The galaxy that the sun

belongs to is the Milky Way.










The Light Year

The distances in space is huge! The distance between planets

in a solar system is tiny compared to the distance between

stars in a galaxy. The distance between the stars in a galaxy

is millions of times smaller than the distance between



For example, the distance between the Earth and the Sun is 

150,000,000,000 m and the distance to the next nearest star

is 39,900,000,000,000,000 m. To make things easier, 

distances in space are referred to as light years.


A light year is the distance traveled by light in one year. One

light year is equal to 9.4605284 × 1015 meters = 

9460528400000000 meters.


Note: A light-year is a measure of distance not time.


For example, the distance between Milky Way and

Andromeda(the next nearest galaxy) is 2.5 million light years.

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Related Topics

Solids-liquids-gases                Forces-movement                           Electricity

Energy                                        Waves                                               Electromagnetism



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