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Galaxy - Wikipedia
Galaxies range in size from dwarfs with just a few hundred million (10 8) stars to giants with one hundred trillion (10 14) stars, each orbiting its galaxy's center of mass. Galaxies are categorized according to their visual morphology as elliptical, spiral, or irregular. Many galaxies are thought to have supermassive black holes at their centers.
List of galaxies - Wikipedia
Named galaxies. This is a list of galaxies that are well known by something other than an entry in a catalog or list, or a set of coordinates, or a systematic designation.
Galaxies—facts and information - Science
Because elliptical galaxies contain older stars and less gas than spiral galaxies, it seems that the galaxy types represent part of a natural evolution: As spiral galaxies age, interact, and merge ...
Galaxies | Science Mission Directorate
The shapes of galaxies are influenced by their neighbors, and, often, galaxies collide. The Milky Way is itself on a collision course with our nearest neighbor, the Andromeda galaxy. Even though it is the same age as the Milky Way, Hubble observations reveal that the stars in Andromeda's halo are much younger than those in the Milky Way.
Galaxies: Collisions, Types and How They're Made | Space
Galaxies are composed of stars, dust, and dark matter, all held together by gravity. They come in a variety of shapes, sizes, and ages.
Galaxies - Universe Today
At an estimated age of a mere 500 million years, it is a babe in diapers compared to the Milky Way at 10-14 billion years, which is the average age of the known galaxies. Scientists think that ...
Galaxies - NASA
The smallest galaxies may contain only a few hundred thousand stars and be several thousand light years across, while the largest galaxies have trillions of stars and may be hundreds of thousands of light years across. Galaxies can be found by themselves, in small groups and in large clusters.
What is a galaxy? | NASA Space Place – NASA Science for Kids
The Hubble Space Telescope looked at a small patch of space for 12 days and found 10,000 galaxies, of all sizes, shapes, and colors. Some scientists think there could be as many as one hundred billion galaxies in the universe. This is the picture taken by the Hubble Space Telescope showing thousands of galaxies. Even the tiny dots are whole ...
Galaxy Facts - Interesting Facts about Galaxies
Galaxy Facts A galaxy is a massive, gravitationally bound system that consists of stars, stellar objects (such as brown dwarfs and neutron stars), nebulae, an interstellar medium of gas and dust, black holes , and an unknown component of dark matter.