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Milky way galaxy looks like a stream of milk across the sky.

Some of its features are;

It is thick at the centre and thin at the edges.

The diameter the disk is 105 light years.

The galactic centre is said to be a black hole.

The distance of our sun from the galactic centre is 27000 light years.

90% of its interstellar matter is in the form of hydrogen

The period of revolution of sun around the galactic centre is about 220 million years with a velocity of around 250 km/s.

The mass of the galaxy is estimated to be 3x1041 kg.

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13y ago

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