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
