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Astronomy test
| Question | Answer |
|---|---|
| Rotation | Rotation is the circular movement of an object around an axis of rotation |
| Revolution | the movement of a planet around the Sun |
| helium and hydrogen | Most common elements in the universe |
| Light year | the distance light travels in one year |
| Waxing | when the amount of illumination on the Moon is increasing |
| Waning | when the amount of illumination on the Moon is decreasing |
| Which side is the moon lit up on during the waxing phases | right side |
| Which side is it lit up on during the waning phases | left side |
| Moon’s revolution period | 29 days |
| How long does it take for the moon to go from new moon to full moon | 29.5 |
| Terrestrial planets | Inner planets nickname |
| Gas planets | Planet that is made out of gas they are larger than inner planets |
| Inner planets | rocky or solid surfaces; Mercury, Venus, Earth, Mars |
| Outer planets | "Gas giants"; Jupiter, Saturn, Uranus, Neptune |
| Asteroids | A large, potatoe shaped object in space that orbits the sun- smaller than planets |
| Asteroid belt | Between the orbits of mars and jupiter |
| 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 |
| nucleus | inner layer of a comets head |
| 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 | nueclear 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 ______________ ______________ stars. | main sequence |
| 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 galaxys are these |
| Irregular | a random scattered type of galaxy |
| What is at the center of a galaxy? | black hole |
| comet | chunks of ice and dust travelling through space |
| coma | outer layer of a comets head |
| tail | gas and dust pushed away from the comet due to solar wind |
| Solstice | Occurs 2 times per year when the sun reaches its highest or lowest point in the sky at noon |
| Equinox | occurs 2 times per year when the sun crosses the plane of the equator |
| What process gives off light/particles in the suns core | fusion |
| white dwarf | a star that has exhasted all its nuclear fuel |
Created by:
kadee1
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