Respuesta :
According to observations, the type of galaxy which was much more common when the universe was 2 billion years old than it is today were irregular galaxies
A galaxy is defined as a collection of stars, stellar remnants, interstellar gas, dust, and dark matter that is gravitationally bound. The name comes from the Greek word galaxies, which translates to mean "milky" and refers to the Milky Way galaxy, which houses the Solar System.
In contrast to spiral or elliptical galaxies, irregular galaxies lack a recognizable regular shape. In addition to not having a nuclear bulge or any indication of spiral arm structure, irregular galaxies frequently have a chaotic appearance and do not fit into any of the regular classes of the Hubble sequence.
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