Browse Reference Articles
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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 -
Dark matter
In astrophysics and cosmology, dark matter is hypothetical matter of unknown composition that does not emit or reflect enough electromagnetic radiation to be observed directly, but whose presence can ... > more -
Compton Gamma Ray Observatory
The Compton Gamma Ray Observatory (CGRO) was the second of the NASA "Great Observatories" to be launched to space, following the Hubble Space Telescope. The observatory was launched on the Space ... > more -
Ultimate fate of the universe
The ultimate fate of the universe is a subject of study in the field of cosmology. Vying scientific theories predict whether the life of the universe is finite or infinite. Current understanding of ... > 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 -
Transit of Venus
A transit of Venus across the Sun takes place when the planet Venus passes directly between the Sun and the Earth, obscuring a small portion of the Sun's ... > more -
Green Bank Telescope
The Robert C. Byrd Green Bank Telescope (GBT) is the world's largest fully mobile radio telescope. It is part of the National Radio Astronomy Observatory (NRAO) at Green Bank, West Virginia ... > more -
Extrasolar planet
An extrasolar planet, or exoplanet, is a planet beyond the Solar System. As of 11 November 2006, 209 extrasolar planets have been discovered. Known exoplanets are members of planetary systems that ... > more
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