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Space

Across
The movement of an object around another object
Occurs in September and marks the beginning of fall in the Northern Hemisphere
African american mathematician who helped caluclate JohnGlenns first orbital flight.
The first women in space
Speed in a given direction
A device that expels gas in one direction to move in the opposite direction
The rise and fall of the ocean's surface influenced by the moons gravity pull on the earth
First man to walk on the moon
An object that revolves around another object in space.
The study of the moon stars and other objects in space
Down
The first American to orbit the earth
Each of two times of the year when days and nights are of equal length
An imaginary line that passes through Earth's center and the North and South poles .
Launched into space by Russians and became the first satellite to orbit the Earth in 1957
The velocity a rocket must reach to fly beyond a planets's gravitational pull
The velocity a rocket must achieve to establish an orbit around Earth
The blocking of sunlight to the moon that occurs when Earth is directly between the sun and moon
The suns location on the first day of spring
Circular movement around an axis
Occurs when the moon passes directly between the Sun and Earth
To come back into the atmosphere after being in space
The angular path followed by an object
The reaction force that propels a rocket forward
National AeronauticsandSpaceAdministration