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Astrophysics
Astrophysics is the branch
of astronomy that deals with
the physics of the universe,
including the physical
properties (luminosity,
density, temperature and
chemical composition) of
astronomical objects such as
... > full story
Supergiant
Supergiants are the most
massive stars. Supergiants
can have masses from 10 to
70 solar masses and
brightness from 30,000 up to
hundreds of thousands times
the solar luminosity. They
vary greatly in radii,
... > full story
Nucleosynthesis
Nucleosynthesis is the
process of creating new
atomic nuclei from
preexisting nucleons
(protons and neutrons). The
primordial preexisting
nucleons were formed from
the quark-gluon plasma of
... > full story
Stellar evolution
In astronomy, stellar
evolution is the sequence of
changes that a star
undergoes during its
lifetime; the hundreds of
thousands, millions or
billions of years during
which it emits light and
... > full story
Browse Reference Articles
1 to 10 of 193 articles
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Planetary nebula
A planetary nebula is an astronomical object consisting of a glowing shell of gas and plasma formed by certain types of stars at the end of their lives. They are in fact unrelated to planets; the ... > more -
Galaxy formation and evolution
The formation of galaxies is still one of the most active research areas in astrophysics; and, to some extent, this is also true for galaxy evolution. Some ideas, however, are now widely accepted. ... > more -
Interstellar medium
The interstellar medium (or ISM) is the name astronomers give to the tenuous gas and dust that pervade interstellar space. Whilst the ISM refers to the matter (interstellar matter, also abbreviated ... > more -
Red supergiant
Red supergiants are supergiant stars of spectral type K-M and a luminosity class of I. They are the largest stars in the universe in terms of physical size, although they are not the most massive. ... > more -
Big Bang nucleosynthesis
In physical cosmology, Big Bang nucleosynthesis (or primordial nucleosynthesis) refers to the production of nuclei other than H-1, the normal, light hydrogen, during the early phases of the universe, ... > more -
Stellar classification
In astronomy, stellar classification is a classification of stars based initially on photospheric temperature and its associated spectral ... > more -
Physical cosmology
Physical cosmology, as a branch of astrophysics, is the study of the large-scale structure of the universe and is concerned with fundamental questions about its formation and evolution. Cosmology ... > more -
Star cluster
Star clusters are groups of stars which are gravitationally bound. Two distinct types of star cluster can be distinguished: globular clusters are tight groups of hundreds of thousands of very old ... > more
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