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Local Group
The Local Group (also called
M31 group or the Andromeda
group) is the group of
galaxies that includes our
galaxy, the Milky Way. The
group comprises over 30
galaxies, with its
gravitational center located
... > 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
Barred spiral galaxy
A barred spiral galaxy is a
spiral galaxy with a band of
bright stars emerging from
the center and running
across the middle of the
galaxy. ... > full story
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 relative,
... > full story
Browse Reference Articles
1 to 10 of 188 articles
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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 -
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 -
Cepheid variable
A Cepheid variable or Cepheid is a member of a particular class of variable stars, notable for a fairly tight correlation between their period of variability and absolute luminosity. Since the ... > more -
Blue supergiant
Blue supergiants are supergiant stars (class I) of spectral type O. They are extremely hot and bright, with surface temperatures of between 20,000 - 50,000 degrees Celsius. The best known example is ... > more -
Light-year
A light-year or lightyear (symbol: ly) is a unit of measurement of length, specifically the distance light travels in a vacuum in one year. While there is no authoritative decision on which year is ... > 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 -
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 -
Large-scale structure of the cosmos
In physical cosmology, the term large-scale structure refers to the characterization of observable distributions of matter and light on the largest scales (typically on the order of billions of ... > 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
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