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Unit 2 Vocabulary

Astronomy

QuestionAnswer
Astronomy the science that deals with the material universe beyond the earth's atmosphere.
Geocentric having or representing the earth as a center
Heliocentric measured or considered as being seen from the center of the sun.
Retrograde Motion is the apparent motion of a planet to move in a direction opposite to that of other bodies within its system,
Ellipse is a curve on a plane surrounding two focal points
Astronomical Unit (AU) a unit of length, equal to the mean distance of the earth from the sun: approximately 93 million miles (150 million km).
Rotation the movement or path of the earth or a heavenly body turning on its axis.
Revolution a. the orbiting of one heavenly body around another. b. single course of such movement.
Precession the slow, conical motion of the earth's axis of rotation, caused by the gravitational attraction of the sun and moon,
Perihelion the point in the orbit of a planet or comet at which it is nearest to the sun.
Aphelion the point in the orbit of a planet or a comet at which it is farthest from the sun.
Perigee the point in the orbit of a heavenly body, especially the moon, or of an artificial satellite at which it is nearest to the earth.
Apogee the point in the orbit of a heavenly body, especially the moon, or of a man-made satellite at which it is farthest from the earth.
Phases of the moon 1. Full moon 2. Waning Moon 3. Third Quarter 4. Waning Cresecnt 5. New 6. Waxing Crescent 7. First Quater 8. Waxing Gibbous
Solar Eclipse the obscuration of the light of the sun by the intervention of the moon between it and a point on the earth
Lunar Eclipse the obscuration of the light of the moon by the intervention of the earth between it and the sun
Crater a large, bowl-shaped cavity in the ground or on the surface of a planet or the moon, typically one caused by an explosion or the impact of a meteorite or other celestial body.
Terrestrial Planet Inner planet
Jovian Planet any of the four large outer planets: Jupiter, Saturn, Uranus, and Neptune.
Nebula a cloud of interstellar gas and dust.
Plantesimal is an object formed from dust, rock, and other materials
Asteroid any of the thousands of small bodies of from 480 miles (775 km) to less than one mile (1.6 km) in diameter that revolve about the sun in orbits lying mostly between those of Mars and Jupiter.
Comet a celestial body moving about the sun, usually in a highly eccentric orbit,
Coma a state of prolonged unconsciousness, including a lack of response to stimuli, from which it is impossible to rouse a person.
Meteoroid any of the small bodies, often remnants of comets, traveling through space
Meteor a small body of matter from outer space that enters the earth's atmosphere, becoming incandescent as a result of friction and appearing as a streak of light.
Meteorite is a solid piece of debris from a source such as an asteroid or a comet, which originates in outer space and survives its impact with the Earth's surface.
Electromagnetic Spectrum is a solid piece of debris from a source such as an asteroid or a comet
Photon a quantum of electromagnetic radiation,
Spectroscopy the science that deals with the use of the spectroscope and with spectrum analysis.
Doppler Effect the change in frequency of a wave
Refracting Telescope is a type of optical telescope
Reflecting Telescope is an optical telescope which uses a single or combination of curved mirrors that reflect light and form an image.
Radio Telescope is a form of radio receiver
Hubble Telescope a telescope launched into orbit around the earth in 1990 to provide information about the universe in the visible, infrared, and ultraviolet ranges
Space Shuttle a rocket-launched spacecraft, able to land like an unpowered aircraft, used to make repeated journeys between the earth and earth orbit.
Created by: Ivy_F
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