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14 Cards in this Set

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Apogee
The point in a satelitte's elliptical orbit farthest from the center of the earth.
Escape Speed
The minimum speed necessary for an object to escape permanently from a gravitational field that holds it.
Gravitational Field
A force field that exists in the space around every mass or group of masses.
Perigee
The point in a satellitte's elliptical orbit where it is nearest to the center of the earth.
Spring Tide
- high or low tide that occurs when sun, earth, moon are lined up so the tides due to the earth and the sun coincide
Black Hole
A mass that has collapsed to so great a density that its enormous local gravitational field prevents light from escaping.
Focus
ellipse- one of the two points for which the sum of the distances to any point on an ellipse is constant.
Lunar Eclipse
the cutoff of light from the full moon when the earth is directly between the sun and moon, so the earth's shadow is cast on the moon
Period
- time required for a complet orbit
Weightlessness
-condition of free fall toward or around the earth, in which an object experiencesno support force
Ellipse
an oval-shaped curve that is the path of a point that moves such that the sum of its distances from two fixed points is constant
Force Field
that which exists in the space surroundng a mass, so that another mass will experience a force
Neap Tide
a tide that occurs when the moon is halfway between a new and full moon. tides due to sun and moon cancel
Solar Eclipse
the cutoff of light from the sun to an observer on the earth when the moon is directly between the sun and the earth