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Astronomy

TermDefinition
Rotation the action of rotating around an axis or center.
Revolution the action by a celestial body of going round in an orbit or elliptical course
Most Common Elements in the Universe Hydrogen and Helium
Light Year a unit of astronomical distance equivalent to the distance that light travels in one year
Waxing the phase between the full and new moon; getting bigger
Waning have a progressively smaller part of its visible surface illuminated, so that it appears to decrease in size.
Which side is the moon lit up on during the waxing phases? A waxing moon will be illuminated on the right side, and a waning moon will be illuminated on the left side.
Which side is it lit up on during the waning phases Left sides
Be able to identify moon phases on a diagram New Moon, First Quarter, Full Moon, and Last Quarter and Waxing Crescent, Waxing Gibbous, Waning Gibbous, and Waning Crescent.
Moon’s revolution period 27.5 days
How long does it take for the moon to go from new moon to full moon? 14 days
Terrestrial Planets Mercury, Venus, Earth and Mars
Gas Planets Neptune, Uranus, Saturn, and Jupiter.
Inner Planets Mercury, Venus, Earth, and Mars
Outer Planets gas giants Jupiter and Saturn and ice giants Uranus and Neptune
Asteroids a small rocky body orbiting the sun.
Asteroid Belts contains irregularly shaped bodies, of many sizes but much smaller than planets, called asteroids
You don’t need to know the difference between meteors, meteoroids, and meteorites. HOWEVER, study them and know a few things about them. a small body of matter from outer space that enters the earth's atmosphere, and appearing as a streak of light.
3 Parts of a Comet The coma, the nucleus, and the tail.
Which direction does the tail point? always point away from the sun
What causes the tail of a comet? As the comet gets closer to the sun it emits dust and microparticles that create the tail.
Photosphere visible surface of the Sun
Corona the outermost part of the sun's atmosphere
Solar Wind a stream of charged particles released from the upper atmosphere of the Sun
Sunspot dark, planet-sized regions that appear on the sun;s surface
Source of Sun’s energy nuclear fusion
Absolute magnitude vs. Apparent magnitude how bright a celestial object really is vs how bright a celestial object is to the human eye from Earth.
90% of the stars on an H-R diagram are ______________ ______________ star Main Sequence
Nebula cloud of dust and gas occupying the space between stars and acting as a nursery for new stars
Main Sequence continuous and distinctive band of stars that appears on plots of stellar color versus brightness
Red Giant a very large star of high luminosity and low surface temperature
Red Supergiant the largest stars in the universe in terms of volume, although they are not the most massive or luminous
Supernova a star that suddenly increases greatly in brightness because of a catastrophic explosion that ejects most of its mass.
Black Dwarf a theoretical stellar remnant, specifically a white dwarf that has cooled sufficiently that it no longer emits significant heat or light.
Black Hole a place where people or things, especially money, disappear without trace.
What causes stars to have different life cycles? its mass
A protostar must start what process to be considered a star? nuclear fusion
Milky Way the galaxy that includes our Solar System
Elliptical type of galaxy with an approximately ellipsoidal shape and a smooth, nearly featureless image
Spiral is a spiral
Irregular have no shape
What is at the center of a galaxy? a black hole
Why are there 42 things to study on this page? 42
Created by: alivingston4665
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