Galaxies are huge ensembles of stars, fuel and dirt, embedded in darkish
matter halos. They’re the essential constructing blocks of the Universe,
gathered in teams, clusters and super-clusters. They exist in lots of
types, both as spheroids or disks. Classifications, such because the Hubble
sequence (primarily based on mass focus and fuel fraction) and the colormagnitude diagram (which separates a blue cloud from a pink sequence)
assist to know their formation and evolution. Galaxies spend a big
a part of their lives within the blue cloud, forming stars as spiral or dwarf
galaxies. Then, through a mechanism that’s nonetheless unclear, they cease forming
stars and quietly finish within the pink sequence, as spheroids. This
transformation could also be as a result of galaxy interactions, or due to the
suggestions of energetic nuclei, by the power launched by their central
super-massive black holes. These mechanisms may clarify the historical past
of cosmic star formation, the speed of which was far higher within the first half
of the Universe’s life.
Galaxies delves into all of those surrounding topics in six chapters
written by devoted, specialist astronomers and researchers within the discipline,
from their numerical simulations to their evolutions.
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