What are galaxy

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What are galaxy

Posted by Saurav Raj 7 years, 11 months ago

CBSE > Class 08 > Science

1 answers

Yogita Ingle 7 years, 10 months ago

Galaxies are collections of stars, dust and gas rotating around super massive black holes. It is believed that there are 200 million or more galaxies in the known universe. A galaxy can range in the number of stars as well as its size.
Small galaxies, such as dwarf galaxies can contain as little as tens of millions of stars, while on the other end of the scale, there are massive galaxies with hundreds of trillions of stars. The diameter of an average galaxy can reach 326,000 light years, meaning that it would take light 326,000 years to cross the average galaxy.

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CBSE > Class 08 > Science