Astronomy Flashcards
1
Q
What is the universe?
A
A collection of billions of galaxies
2
Q
What is a galaxy?
A
A collection of billions of stars
3
Q
Which galaxy are we in?
A
The Milky Way
4
Q
What force causes the moon to orbit the earth?
A
Gravity
5
Q
What force causes all orbits?
A
Gravity
6
Q
What is a comet?
A
A dirty ball of rock and ice
7
Q
What is the shape of a comet’s orbit?
A
Highly elliptical
8
Q
What direction does the tail of a comet point?
A
Away from the sun
9
Q
How does the speed of a comet vary around its orbit?
A
Faster the closer you get to the sun.
10
Q
What is a moon?
A
A natural satellite
11
Q
What is a satellite?
A
Something that orbits a planet
12
Q
What is the equation for orbital speed?
A
v = 2 x pi x radius / time period
13
Q
Why is g different on the moon?
A
It has less mass
14
Q
Why is g different on mars?
A
It has a different mass
