Galaxies

The Sombrero galaxy

Galaxies

Galaxies are vast collections of stars, gas, dust, and, possibly, mysterious dark matter brought together by gravity.

Spiral galaxies like the Milky Way form new stars and are shaped like discs with central bulges.

Elliptical galaxies look like the bulges in spiral galaxies without the surrounding disc and mainly contain old stars.

Irregular galaxies do not have a standard shape and tend to have many new stars. Another type of galaxy called lenticular (also called S0) has a smaller disc, central bulge and is primarily full of older stars.

Image: A Hubble Space Telescope image of the Sombrero galaxy, M104 (credit: NASA)

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The Sombrero galaxy

Introduction

Gravity gathers stars, gas, dust and dark matter.

About Galaxies

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