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