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Astronomy: Part 1

TermDefinition
Astronomy The science that studies the universe.
Geocentric Models/beleifs pertaining to the Earth as being the center of the universe, and that other planets orbit it.
Heliocentric The models showing that the sun is the center of the universe, and that other planet orbit it.
Retrograde motion The westward shift deriving from the Earth and another planet's own motion around the sun.
Ellipse An oval shaped path taken by a planet during orbit.
Astronomical Unit (AU) The average distance between Earth and the sun.
Rotation The turning and spinning of a body on it's axis
Revolution The motion of a body around some point in space.
Precession The slight movement of Earth's axis.
Perihelion The time in which the Earth is closest to the sun; usually around the 3rd of January.
Aphelion The time in which the Earth is farthest from the sun; around the 4th of July.
Perigree The point where the Earth is closest to the moon.
Apogee The point where the Earth is farthest from the moon.
Phases of the moon The result of the sunlight reflected on the moon combined with the moon's own movements.
Solar eclipse When the moon moves in a line directly between the Earth and the sun.
Lunar eclipse When the moon moves withen the Earth's own shadow.
Crater Round depressions in the surface of the moon.
Terrestrial planet Relativly small and rocky planets.
Jovian planet Gas giants.
Nebula A cloud of dust and gas in space.
Planetesimal Small, irregualrly shaped bodies formed by the colliding/combining of matter in space.
Asteroid Small rocky bodies that drift through space.
Comet Peices of rocky and metallic materials held together by frozen gases.
Coma The glowing head of a comet as the it gets closer to the sun and begind to vaporize.
Meteoroid A small solid particle that drifts through space.
Meteor Metoeoids that enter Earth's atmosphere, then burn up.
Meteorite A meteoroid that reaches Earth's surface.
Electromagnetic spectrum The arraingement of rays according to their wavelengths and frequinces.
Photon Light that creates a stream of paticles.
Sceptroscopy The study of the properties of light that depend on wavelength.
Doppler Effect The percieved change in wavelength of a wave that is emitted from a source moving towards or away from an object.
Refracting Telescope A telescope that uses a lens to bend or refrect light.
Reflecting Telescope A telescope that uses a concave mirror that focuses the light infront of a mirror, rather than behind it, like a lens.
Radio Telescope A telescope that detects and percieves radio waves using an antenna.
Hubble Telescope The first space telescope, built by NASA.
Space Shuttle A spacecraft propelled by rockets used to venture outside of the Earth's atmosphere.
Created by: 3172004
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