| Question | Answer |
|---|---|
| Big Bang Theory | the theory that the universe was formed about 13.7 billion years ago, from a large explosion or expansion, and is continuing to expand |
| Galaxy | a large group of stars in the universe |
| Spiral Galaxy | galaxy that is pinwheel shaped with a thin disk with long arms; gas and dust rotate around the central hub of the galaxy |
| Elliptical Galaxy | huge galaxy that is round or oval in shape |
| Irregular Galaxy | huge galaxy with no regular shape |
| Star | huge, hot body made of different gases; radiates energy (light) |
| Nebula | an immense cloud of gas (mainly hydrogen) and dust in space; where stars form |
| light year (ly) | distance light can travel in a vacuum in one year; equal to approximately 5.
87 X 10 to the power of 12 miles; the unit of measure used by astronomers to determine distances in space |
| Planets | nearly round objects that revolve around a star; in our solar system |
| Sun | medium sized star; located near edge of galaxy; many thousands of times closer to Earth than any other star; provides energy that creates convection currents in atmosphere and oceans |
| Comet | small object made of ice with some gas, dust, and rock; a "tail" can appear as the comet revolves around the sun and is heated |
| Hertzsprung-Russell Diagram | organizes the family of stars into a diagram; across bottom is star's temperature and side is star's absolute magnitude; a star's temperature and color depend on how big the star is |
| Electromagnetic Spectrum | increasing range in frequency of electromagnetic waves; light and radio waves are used to gain information about distances and properties of objects in the universe; ex. light years used to measure distances and sizes in the universe |
| Phase of moon after the new moon | waxing crescent |
| Phase of moon after waxing crescent | 1st quarter |
| Phase of moon after 1st quarter | waxing gibbous |
| Phase of moon after waxing gibbous | full moon |
| Phase of moon after full moon | waning gibbous |
| Phase of moon after waning gibbous | 3rd quarter |
| Phase of moon after 3rd quarter | waning cresent |
| Phase of moon after waning crescent | new moon |
| waxing means | growing |
| waning means | shrinking |
| the force of attraction between all masses in the universe; especially the attraction of the earth's mass for bodies near its surface | Gravitational Attraction |
| Lunar eclipse | When the earth is between the sun and the moon |
| Solar eclipse | When the moon is between the earth and the sun |
| The moon's gravitational pull on earth causes | high and low tides |
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7/8th grade earth and space science
7/8th grade earth and space science. (2018, Oct 23). Retrieved from https://artscolumbia.org/78th-grade-earth-and-space-science-31051-60694/
