Topic 8 Astrophysics Flashcards
1
Q
What does the solar system consist of?
A
The Sun orbited by 8 (9) planets.
2
Q
Describe a galaxy.
A
A large collection of billions of stars.
3
Q
What is a comet?
A
A lump of ice and dust that orbits the Sun in an orbit much more elliptical than the planets.
4
Q
What is a star?
A
A vat body of hot gases in space.
5
Q
What is the formula for orbital speed?
A
v= 2 x π x r
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T
6
Q
How many moons does Jupiter have?
A
62
7
Q
How many moons does Venus have?
A
0
8
Q
How many moons does Saturn have?
A
34
9
Q
In what galaxy is our Solar System?
A
The Milky Way
10
Q
Explain what is caused by Gravitational Force.
A
- Causes moons to orbit planets.
- Causes the planets to orbit the Sun.
- Causes artificial satellites to orbit the Earth.
- Causes comets to orbit the Sun.
11
Q
Explain why gravitational field strength varies on different planets.
A
The gravitational field of a planet (or moon) depends on its mass and the radius.
