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Unit 2 Vocabulary

Unit 2 Vocabulary Words

TermDefinition
Astronomy the scientific study of the universe
Geocentric describes the concept of an earth-centered universe
Heliocentric describes the view that the sun is at the center of the solar system
Retrograde motion the apparent westward motion of the planets with respect to the stars
Ellipse an oval
Astronomical Unit (AU) average distance from the earth to the sun
Roatation the spinning of a book, such as Earth, about its axis
Revolution the motion of one body about another, as Earth about the sun
Precession a slow motion of Earth's axis that traces out a cone over a period of 26,000 years
Perihelion the point in the orbit of a planet where it is closest to the sun
Aphelion the place in the orbit of a planet where the planet is farthest from the sun
Perigree the point at which the moon is closest to Earth
Apogee the point where the moon is farthest from the earth
Phases of the Moon the progression of changes in the moon's apperance during the month
Solar Eclipse an eclipse of the sun; a solar eclipse occurs when the moon moves in a line directly between Earth and the sun, casting a shadow on Earth.
Lunar Eclipse a lunar eclipse of the moon; a lunar eclipse occurs when the moon passes through Earth's Shadow
Crater the depression at the summit of a volcano or that which is produced by a meteorite impact
Terrestial planet any of the Earth-like planets, including Mercurys, Venus, Mars, and Earth
Jovian planet the Jupiter-like planets; Jupiter, Saturn, Uranus, and Neptune
Nebula a cloud of gas and/or dust in space
Planetesimal small, irregularly shaped body formed by colliding matter
Asteroid a small, rocky body that can range in size from a few hundred kilometers to less than a kilometer
Comet a small body made of rocky and metallic pieces held together by frozen gases
Coma the fuzzy, gaseous component of a comet's head
Meteoroid a small, solid particle that travels through space
Meteor the luminous phenomenon observed when a meteroid enters Earth's atmosphere and burns up, popularly called a shooting star
Meteorite any portion of a meteroid that reaches earths surface
Electromagnetic spectrum the arrangement of electromagnetic radiation according to wavelength
Photon a small packet of light energy
Spectroscopy the study of the properties of light that depend on wavelength
Doppler Effect the apparent change in frequency of electromagnetic or sound waves caused by the relative motions of the source and the observer
Refracting Telescope a telescope that uses a lens to bend and concentrate the light from distant objects
Reflecting Telescope a telescope that concentrates light from distant objects by using a concave mirror
Radio Telescope a telescope designed to make observations in radio wavelengths
Hubble Telescope telescope named after the scientist Hubble
Space Shuttle spacecraft that allows US astronauts to travel to space
Created by: DylanMcCarty22