1.2 Earth in the Solar System, Galaxy, and Universe Flashcards
1
Q
Galaxy
A
A massive system of stars, gravitationally bound to one another.
2
Q
Geocentric model
A
The ancient theory that the heavenly bodies and stars orbited Earth.
3
Q
Habitable zone
A
The region around a star in which liquid water can exist on the surface of planets, and which can therefore support advanced life.
4
Q
Heliocentric model
A
The theory that the sun is at the center of the solar system; Earth and the other planets orbit the sun, and the moon orbits Earth.
5
Q
Milky Way galaxy
A
The spiral galaxy our solar system is located in.
6
Q
Universe
A
The collection of all matter and energy that exists, as well as space and time themselves.
