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Glossary

This page is meant to make it easier for you to understand the content of this web site. The glossary contains both astronomical and art terms.


G

Galactic Halo: The circular region surrounding the disk of a spiral galaxy. The halo is composed mostly of old globular clusters.

Galaxy: A system of millions, sometimes billions or trillions of stars, held together by gravity. Link: Galaxies.

Galaxy cluster: A system of several galaxies, held together by gravity.

Galileo: A space probe sent to study jupiter. A part of it was sent down to jupiter's atmosphere and sruvived until it reached a depth where the pressure was 22 times larger than earth's atmosphere.

Galileo Galilei (1564 - 1642): Galileo is mostly known for constructing the first telescope and making discoveries that challenged the conception of the world the church had. He also discovered jupiters four largest moons, which were named after him.

Gamma ray: The most energetic form of energy. It usually comes from black holes or quasars.

Globular cluster: A spherical system of stars (often thousands of stars) in a dense area. Globular clusters are mostly found in halos of galaxies. These clusters contain some of the oldests stars in the universe.

Gravitational collapse: When the gas pressure exertinga force outwards cannot match the gravitational force of the matter of the star, which is pointing inwards, a star collapses. Many times during a star's life time does this occurr. When the collaps occurrs the pressure and heat increases in the center of the star. Link: Stellar formation, collapsing clouds.

Gravitational lens: When light passes close to a massive object the light is affected by it, and slightly changes it's course, similar to when light passes through a lens.

GRB: A few times a day, an enormous explosion lasting about a second is detected. This kind of explosions emit large amounts of gamma rays. Astronomers do not know the source of these gamma ray emissions.







 




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