How many galaxies are there in the Universe?

Galaxy comes from the Greek name for the galaxy we live in – and has its origins in the Greek word milk. We don’t know. Every time astronomers look into the Universe they discover more galaxies. Some parts of the Universe have not been looked at yet, and there are other parts that telescope cannot see. The best estimate by astronomers is that there are at least 125 billion galaxies out there.

Ø  Galaxies are huge star system, made of stars and large amounts of gas and dust.

Ø  They come in a range of sizes and shapes consisting of millions, billions, or even trillion of stars.

Ø  Some, known as active galaxies, have unexpected amounts of energy that come from star material falling into a black hole.

Ø  Other galaxies are transformed by galactic collisions.

The galaxy we live in is the Milky Way Galaxy. Apart from it, three galaxies are easily seen with the naked eye from Earth – Andromeda, the Large Magellanic Cloud, and the small Magellanic Cloud.

   Black holes

Ø  A black hole is a region of incredibly powerful gravity that drags matter towards it and squeezes it into a tiny space or point, which is called a singularity.

Ø  They are called “black” because the light that is sucked in cannot get out.

Ø  You get black holes when massive stars explode. These explosions are called supernovas.

Ø  You also get black holes at the centre of active galaxies, where their mass is equivalent to millions of Suns.

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