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Orion Nebula
The Orion Nebula (also known
as Messier 42, M42, or NGC
1976) is a glowing emission
nebula with a greenish hue
and is situated below
Orion's Belt. It is one of
the brightest nebulae
visible to the naked eye in
... > full story
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
... > full story
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 by ISM) that
... > 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 180 articles
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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 the Big ... > more -
Magellanic Clouds
The two Magellanic Clouds are irregular dwarf galaxies orbiting our Milky Way galaxy, and thus are members of our Local Group of galaxies.The Large Magellanic Cloud (LMC) and its neighbour and ... > 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 -
Spitzer Space Telescope
Spitzer Space Telescope (formerly the Space Infrared Telescope Facility [SIRTF]) is an infrared space observatory, the fourth and final of NASA's Great Observatories. The first images taken by SST ... > more -
Stellar classification
In astronomy, stellar classification is a classification of stars based initially on photospheric temperature and its associated spectral ... > more -
Open cluster
An open cluster is a group of up to a few thousand stars that were formed from the same giant molecular cloud, and are still loosely gravitationally bound to each other. In contrast, globular ... > more -
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 ... > more -
Andromeda Galaxy
TThe Andromeda Galaxy (also known as Messier 31, M31, or NGC 224; older texts often called it the Andromeda Nebula) is a spiral galaxy approximately 2.5 million light-years away in the constellation ... > more -
Brown dwarf
Brown dwarfs were originally called black dwarfs, a classification for dark substellar objects floating freely in space which were too low in mass to sustain stable hydrogen ... > more -
Chandra X-ray Observatory
Chandra X-ray Observatory is a satellite launched on STS-93 by NASA on July 23, 1999. It was named in honor of Indian-American physicist Subrahmanyan Chandrasekhar who is known for determining the ... > more
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