Earth And Space Flashcards
1
Q
Galaxies
A
system of millions or billions of stars, together with gas and dust, held together by gravitational attraction.
2
Q
Solar system
A
A collection of planets there moons and a star
3
Q
Astronomer
A
Someone who studies the science that deals with the universe beyond the earth’s atmosphere
4
Q
Expanding universe
A
The expansion of the universe is the increase in distance between any two given gravitationally unbound parts of the observable universe with time.
5
Q
Singularity
A
a point of infinite density and gravity
6
Q
Gravity
A
The force that pulls stuff with mass down
