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Astronomy Definitions Edit

The world of astronomy is a wide and wonderful place. With majestic planets, breath-taking constellations, or exciting displays of light as a meteor or comet flies across the evening sky. But the view is so much more interesting when you know what those are. So here are some links to the definition pages along with a description.


  • Universe : Everything that physically exists including living organism, the entirety of space and time, all forms of matter and energy, and the physical laws and constants that govern them.
  • Galaxy Cluster : A group of galaxies.
  • Galaxy : A massive system consists of stars and stellar remnants, an interstellar medium of gas and dust, and an unknown object called dark matter.
  • Quasar : A quasar (contraction of QUASi-stellAR radio source) is an extremely bright and distant active nucleus of a young galaxy.
  • AGN: Active Galactic Nucleus : An active galactic nucleus (AGN) is a compact region at the centre of a galaxy which has a much higher than normal luminosity over some or all of the electromagnetic spectrum.
  • Galactic Core : The Galactic Core is the rotational center of the Milky Way galaxy.
  • Galactic arm : A string of stars which radiates out from the galactic core
  • Star Cluster : A cluster of stars
  • Nebula : An interstellar cloud of dust, hydrogen gas, helium gas and plasma that takes a shape.
  • Star System : Related to a galaxy, except it doesn't have planets or planetoids
  • Star : A large ball of hydrogen that is constantly in fission.
  • Planet : A large rock or gas, usually has a liquid core and is sphere shaped that is orbiting a star.
  • Asteroid : A large rock, sometimes known as a planetoid.
  • Meteor : Small chunks of asteroids or comets that fall into the earths Atmosphere and burn up.
  • Substance : In chemistry, are material objects that can undergo various transformations related to artificial or natural phenomena
  • Plasma : Plasma is typically an ionized gas, and is usually considered to be a distinct state of matter in contrast to gases because of its unique properties.
  • Atom : A collection of protons, neutrons, and electrons
  • Sub-atom : Anyone of the 3 particles in atoms.
  • Dipole : In physics, there are two kinds of dipoles (Hellènic: di(s)- = twi- and pòla = pivot, hinge). An electric dipole is a separation of positive and negative charge. The simplest example of this is a pair of electric charges of equal magnitude but opposite sign, separated by some, usually small, distance. By contrast, a magnetic dipole is a closed circulation of electric current. A simple example of this is a single loop of wire with some constant current flowing through it
  • Length : A measurement of space
  • Time : The measurement used to determine the time each event happens in the Universe
  • Motion : Any movement created by energy
  • Force : Something that can push or pull, like gravity or humans
  • Energy : Energy is the ability to do work -

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