50 Examples of Galaxies

The galaxies they are huge groups of stars that interact gravitationally, and always revolve around a common center. There are hundreds of trillions of galaxies in the universe, each containing more than a trillion stars at a time, varying in size, shape, and brightness. For example: Andromeda, NGC 6822, Centaurus A.

Planet Earth, like the entire Solar System, belongs to one of all those galaxies called Milky Way (translatable as "milk road"), which bears that name because seen from Earth, the galaxy looks like a milk stain in the sky.

The galaxies they are made up of stars, gas clouds, planets, cosmic dust, dark matter, and energy are the elements that necessarily appear in a galaxy. At the same time, some substructures such as nebulae, star clusters, and multiple star systems make up galaxies.

Classification of galaxies

The different forms of the galaxies give rise to a morphological classification, from which each group in turn has some characteristics.

History of galaxies

The Persian astronomer is usually pointed out

al-Sufi as the first to intuit the existence of galaxies, and then to the French Charles Messier as the first compiler, at the end of the century XVIII, of non-stellar objects that included about thirty galaxies.

All galaxies have a source and one evolution, the first having formed about 1000 million years after the big-bang. The training came from the atoms hydrogen and helium: with fluctuations of density is that the largest structures began to appear, which then gave rise to galaxies as they are known today.

Future of galaxies

Looking forward, it is to be expected that new generations of stars they occur as long as spiral galaxies have molecular hydrogen clouds in their arms.

This hydrogen is not unlimited but has a finite supply, so once the formation of new stars is exhausted it will come to an end: in galaxies like the Milky Way, The current era of star formation is expected to continue for the next 100 billion years, to decline as the stars fade further. little.

Examples of galaxies near Earth

A large number of galaxies will be listed below, starting with those closest to Earth along with their distance from our planet:

Examples of more distant galaxies