Unit 2 - Topic 3 - The Earth and Universe Flashcards
1
Q
What is the sun composed of?
A
Hydrogen
Helium
2
Q
How are stars formed?
A
Stars are formed when large amounts of dust and gas are drawn together by gravitational forces.
3
Q
What are the main features of the solar system?
A
Sun Rocky planets Gas planets/Giants Asteroids and comets Moons
4
Q
What provides the centripetal force for the orbital motion of planets, comets, moons and artificial satellites?
A
Gravity
5
Q
The stability of stars depends on …
A
The balance between gravitational force and gas/radiation pressure.
6
Q
Uses of artificial satellites
A
Observation of earth
Weather monitoring
Astronomy
Communications
