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Astronomy
| Term | Definition |
|---|---|
| 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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