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Space Systems 2

Key Vocabulary for Space Systems Lesson 3

TermDefinition
Phase the different shapes of the moon you see from Earth
Eclipse when an object in space comes between the sun and a third object, it casts a shadow on the third object
Umbra the very darkest part of the shadow during an eclipse, where the light from the sun is completely blocked
Penumbra the area of the shadow during an eclipse where the sun is only partially blocked
Tide the rise and fall of ocean water that occur approximately every 12.5 hours, and are a result from gravitational differences between Earth, the moon, and the sun
Spring Tide when the gravity of the sun and moon combine to produces a significant difference between low and high tide (during new moon and full moon phases)
Neap Tide when the moon, sun, and earth are at a right angle and the moon and sun's gravity is pulling in different directions to cause the least difference in high and low tide (1st and 3rd quarter moons)
Waxing when the amount of light reflected/illuminated on the moon appears to grow /increase each night
Waning when the amount of light reflected/illuminated on the moon appears to disappear/shrink each night
Created by: jbohannon