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21 Cards in this Set
- Front
- Back
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What is the difference between revolution and rotation? |
Revolution is the movement of an object around another object. Rotation is the spinning motion of a planet on its axis. |
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How long does one rotation of earth take, and how long does one revolution of earth take? |
one rotation= 24hrs one revolution= 1 year |
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What causes day and night on Earth? |
The rotation of the Earth on its axis causes day and night. |
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What causes the seasons? |
Earth has seasons because its axis is tilted as it orbits the sun |
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Spring tide |
The tide with the greatest difference between consecutive low & high tides |
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Neap tide |
The tide with the least difference between consecutive low & high tides |
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equinox |
Either of the 2 days of the year on which neither hemisphere is tilted toward or away from the sun |
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Solstice |
Either of the 2 days in the year on which the sun reaches its greatest distance north and south of the equator |
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The phases of the moon you see on earth depends on what? |
depends on how much sunlit side faces Earth |
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Umbra |
The darkest part of a shadow |
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Penumbra |
The part of the shadow surrounding the darkest part |
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How did the moon form? |
The collision ring theory. It is theorized that a plant-like object collided with Earth. Materials and Earths outer layers went into orbit around Earth, where a ring formed. Gravity caused this material to clump together to form the moon. |
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How large is the moon compared to Earth? |
1/4 the size of Earth |
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How does the moon having no atmo effect the temps on the moon? |
Temps. vary greatly because of no atmo. The moons surface gravity is so weak that gases can easily escape into space. |
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Law of Universal Gravitation |
scientific law that states that every object in the universe attracts every other object. |
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The strength of gravity depends upon the _____ of the objects, and the ________ between them. |
1. masses 2. distance |
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What was the space race? |
1950's- soviet union and USA compete in exploration of outer space. |
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who was the first man to walk the moon? |
Neil Armstrong |
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What is the ISS and what is its purpose? |
The International Space Stations purpose is to be able to provide a home for people doing research in space (long-term) |
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What is a space shuttle and how has NASA used them in the past? |
A space shuttle is a spacecraft that can carry a crew into space, return to Earth, and then be reused for the same purpose. NASA has used space shuttles to take satellites into orbit, repair damaged satellites, & carry astronauts |
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What are space spinoffs? 2 examples of space spinoffs. |
a space spinoff is an item that has uses on Earth, but was originally developed for use in space. ex: freeze-dried food, radio telescope |
