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Gravity Glossary

A

accelerate
A change in velocity
atmosphere
The blanket of air around the earth
atom
Tiny building block of matter - too small to see

C

centrifugal
From the Latin word for away from the center
centripetal
From the Latin word for moving toward the center
communication
Sharing of information by talking or other methods

D

debris
Objects no longer used or needed
dense
Thick or containing a large amount of matter in a limited space
displace
Move out of place

E

escape velocity
The speed required to leave gravitational pull

G

Galileo Galilei
Italian scientist who lived in the late 16th and early 17th century
gravitational
Related to gravity
gravity
The attraction of two objects of mass

H

helium
A gas that is lighter than most other gases

M

mass
The amount of matter in an object
microgravity
The apparent lack of gravity due to free fall
Milky Way Galaxy
The galaxy that the planet earth and its solar system dwells

O

orbit
The revolving of one object around another

P

pressure
The pushing of one matter on another
proximity
closeness

R

revolve
To move around another object

T

tides
The movement of the ocean level

V

velocity
The speed of an object in one direction

W

wind resistance
The drag or push of air against a moving object

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