Galaxies

Galaxy is derived from the Greek word for “milky”, referring to the Milky Way, the galaxy that contains the solar system and that we live in. Galaxies are gravitationally bound systems of stars, stellar remnants, interstellar gas, dust and dark matter. Their size ranges from just a few hundred million to one hundred trillion stars. Many galaxies comprise a supermassive black hole at the centre. It is then that black hole that is the galaxy's centre of mass and around which all the galaxy's stars are orbiting.Galaxies are usually categorized according to their visual morphology. The can be of elliptical, spiral or irregular shape. Irregular shapes include ultra diffuse galaxies, lenticular galaxies, ring galaxies as well as galaxies with disrupted or completely irregular structures.It is estimated that there are about 200 billion to 2 trillion galaxies, containing more stars than there are grains of sand on our planet. Due to the vast number, most of the galaxies are either unnamed or are just known by a number and often lack a descriptive name. The galaxies shown are knows as: Centaurus A (NGC 5128), NGC 253, NGC 454, NGC 520, NGC 986, NGC 1232 and NGC 6050, which is colliding with IC 1179.

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