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19 Cards in this Set
- Front
- Back
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define astronomy |
the scientific study of what is beyond Earth |
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define Universe. What does it include |
everything that exists, including all energy, matter, and space |
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define celestial object |
any object that exists in space |
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define star |
a massive collection of gases, held together by its own gravity and emitting huge amounts of energy |
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define luminous |
producing and giving off light; shining |
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write 6 800 000 in Scientific Notation |
6.8 x 10^6 |
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define planet |
a large, round celestial object that travels around a star |
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define Solar System |
the sun and all the objects that travel around it |
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define satellite and give an example of one |
a celestial object that travels around a planet or dwarf planet e.g. a moon |
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define astronomical unit (a.u) |
approximately 150 million kilometers; the average distance from Earth to the Sun |
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define orbit |
the closest path of a celestial object or satellite as it travels around another celestial object |
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define galaxy |
a huge, rotating collection of gas, dust, and billions of stars, planets, and other celestial objects |
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where is a meteoroid, meteor, and meterorite |
meteroid - space meteor - crosses the atmosphere meteorite - hits the ground |
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define comet |
a chunk of ice and dust that travels in a very long orbit around the sun |
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what does one rotation around the earths axis equal |
one day
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what is the earths tilt in degrees |
23.5 degrees |
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what does the tilt of the earth cause |
seasons |
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what is the aurora borealis |
a display of shifting colours in the northern sky |
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what causes the auroras |
solar particles colliding with matter in Earth's upper atmosphere
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