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Definition
| The longest day of the year when the sun seems to stop moving higher in the sky each day. |
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| The shortest day of the year when the sun can not get any lower in the sky. |
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| Neither the north pole nor the south pole are tilted toward the sun. Spring begins. |
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| Neither the north pole nor the south pole are tilted toward the sun. Fall begins. |
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Term
| Van Allen radiation belts |
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Definition
| Two doughnut-shaped regions of charged particles that trap some of the particles in solar wind. |
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Definition
| The collisions of charged particles trapped by the Van Allen radiation belts with particles in the Earth's upper atmosphere. |
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Definition
| Areas of mountains on the moon |
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Definition
| Broad, lowland plains that surround the mountains on the moon. |
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Definition
| Long valleys that criss cross the moon's surface, possibly caused by volcanoes. |
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| The point of the moon's orbit closest to Earth. |
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| The point of the moon's orbit farthest from the Earth. |
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Definition
| When the new moon comes directly between the sun and the Earth. |
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Definition
| The small, inner shadow in an eclipse. |
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Definition
| The large, outer shadow of an eclipse. |
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| When the Earth comes directly between the sun and the full moon. |
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Definition
| The rise and fall of the oceans caused by the Earth's gravity. |
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Definition
| Tides that are higher during the full moon and the new moon. |
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Definition
| Lower tides when the moon is at the first and last quarter phases. |
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Definition
| An orbit that revolves around the Earth at a rate equal to the Earth's rotation rate. |
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Definition
| Communicatons, weather, navigation, scientific. |
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| First Satellite launched by the US. |
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Definition
| A space station launched by the US designed to allow astronauts to perform experiments in space. |
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Definition
| this has replaced the Skylab. It is launched by the Space Shuttle. |
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Definition
| Funnel-shaped pit or depression on the moon's surface. |
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Definition
| Largest crater on the moon's surface. |
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Term
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Definition
1. It was captured by the Earth's gravity.
2. It was formed from the same swirling cloud of gas and dust from which the sun, Earth, and other planets were formed.
3. Born when a meteorite struck the Earth and tore a chunk of material from the planet. |
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Definition
| The space probe that photographed the side of the moon away from the earth. |
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| The direction the moon moves. |
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| The first human to set foot on the moon. |
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Definition
| The Lunar Module used to explore the moon. |
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Definition
| The command module that orbited the moon with Michael Collins inside while Neil Armstrong and Edwin Aldrin explored the moon. |
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