These small galaxies are believed to be the result of collisions between larger spiral galaxies. During such collisions pieces of the spiral arms get flung out into space, becoming small irregular galaxies.
Yes, there are stars between galaxies. When there are collisions or interactions between galaxies, stars can be ripped out of the galaxies. These stars will then wander into space between galaxies. Such stars have been observed with the Hubble Space Telescope. Taken from http://curious.astro.cornell.edu/question.php?number=384
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Yes, there are. These generally come about when they are ejected from their host galaxy by the huge gravitational interaction involved in the collisions of galaxies.
Cosmic Collisions - 2009 Galaxies 1-3 was released on: USA: 28 January 2009
Galaxy collisions are common in the universe because of the vast distances between galaxies and the gravitational forces that pull them towards each other. Over time, these gravitational forces can cause galaxies to collide and merge, creating new and larger galaxies.
Observations of galaxies captured by telescopes like the Hubble Space Telescope show distorted shapes and tidal tails, indicating interactions and collisions between galaxies. Redshift data also reveals galaxies gravitationally interacting and merging as they move closer together in the Universe. Computer simulations based on astronomical models also support the theory of galactic collisions.
astronomers did
They create larger galaxies. Sometimes they can make mysterious celestial happenings....
The shape of a galaxy is primarily determined by its rotation and gravitational forces. Spiral galaxies, for example, have well-defined arms due to the rotation of their stars and gas. Elliptical galaxies have a more rounded shape due to the random motion of their stars.
Active Galaxies are thought to be powered by rotation
Galaxies moving toward each other at different speeds are called interacting galaxies. These interactions can result in tidal forces, collisions, and merging of the galaxies, leading to various changes in their structures.