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astronomy
| Question | Answer |
|---|---|
| Rotation | spinning around an axis |
| Revolution | physically moving in orbit |
| Most common elements in the universe | hydrogen and helium |
| Light year | how far light moves in one year |
| Waxing | the moon at any time after new moon and before full moon |
| Waning | its visible surface area is getting smaller |
| Which side is the moon lit up on during the waxing phases? | right side is lit up |
| Which side is it lit up on during the waning phases | left side is lit up |
| moons revolution period | 27 days/ a month |
| terrestrial planets | mercury, venus, earth, and mars |
| gas planets | neptune, jupiter, uranus, and saturn |
| inner planets | mercury, venus, earth, and mars |
| outer planets | neptune, jupiter, uranus, and saturn |
| asteroid belt | locates between the orbits of the planets Jupiter and mars and consists of asteroids or minor planets. |
| meteoroids | a rocky object that orbits the sun |
| meteors | a meteoroid that has entered Earths atmosphere |
| meteorites | a meteor that has hit or landed on the surfaceof Earth |
| three parts of a comet | the tail, the nucleus, and the coma |
| which direction does a comet tail point | away from the sun |
| what causes the tail of a comet | the suns pressure |
| Photosphere | visible surface of the sun |
| Corona | an aura of plasma that surrounds the Sun and other stars |
| Solar wind | a stream of charged particles released from the upper atmosphere of the Sun |
| Sunspot | dark, planet-sized regions that appear on the "surface" of the Sun |
| Source of Sun’s energy | nuclear fusion |
| Absolute magnitude | Absolute magnitude is a measure of the luminosity of a celestial object, on an inverse logarithmic astronomical magnitude scale |
| Apparent magnitude | the magnitude of a celestial object as it is actually measured from the earth. |
| 90% of the stars on an H-R diagram are | main sequence stars |
| Nebula | a huge cloud of dust and gas in space held togetherby gravity; star nursery |
| Main sequence | 90% of all stars are this |
| Red giant | the stage after main sequence for a small to medium mass star; fuel begins to run out. |
| Red supergiant | a star that is among the most massive and brightest of all stars |
| supernova | an extremely bright explosion of a star |
| black dwarf | dead start that no longer gives off light or heat |
| black hole | gravitational field so strong that even light can't escape |
| what causes stars to have different life cycles | its mass |
| a protostar must start what process to be considered a star? | hydrogen fusion |
| milky way | a spiral shaped galaxy in which we live in |
| elliptical | a smooth, circular or oval shaped galaxy |
| spiral | a flat, disk shaped galaxy. 72% of all galaxy's are these |
| irregular | a random scattered type of galaxy |
| what is the center of the galaxy | black hole |
Created by:
claireholton
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