The chronology of the universe describes the history and future of the universe according to Big Bang cosmology.
The Hubble Ultra Deep Fields often showcase galaxies from an ancient era that tell us what the early Stelliferous Era was like.
Another Hubble image shows an infant galaxy forming nearby, which means this happened very recently on the cosmological timescale. This shows that new galaxy formation in the universe is still occurring.
Phases of the reionization
Computer simulated view of the large-scale structure of a part of the universe about 50 million light-years across
A dwarf galaxy is a small galaxy composed of about 1000 up to several billion stars, as compared to the Milky Way's 200–400 billion stars. The Large Magellanic Cloud, which closely orbits the Milky Way and contains over 30 billion stars, is sometimes classified as a dwarf galaxy; others consider it a full-fledged galaxy. Dwarf galaxies' formation and activity are thought to be heavily influenced by interactions with larger galaxies. Astronomers identify numerous types of dwarf galaxies, based on their shape and composition.
The Large Magellanic Cloud, a satellite galaxy of the Milky Way
Dwarf galaxies like NGC 5264 typically possess around a billion stars.
The Phoenix Dwarf Galaxy is a dwarf irregular galaxy, featuring younger stars in its inner regions and older ones at its outskirts.
UGC 11411 is a galaxy known as an irregular blue compact dwarf (BCD) galaxy.