The Speed of Light Flashcards
1
Q
What does light travel at?
A
Very high but finite (limited) speeds
2
Q
What happens if the distance is great enough?
A
The speed of light can be measured
3
Q
What is the speed of light through space (a vacuum)?
A
It is 300,000km/s (around one million times faster than sound).
4
Q
How long does light from Earth take to reach the moon?
A
Just over 1 second
The moon is approximately 384,400km away
5
Q
How long does Sunlight take to reach Earth?
A
8 minutes
6
Q
What happens when we look at the sun?
A
We it as it was 8 minutes earlier
7
Q
What are Vast Space Distances measured in?
A
Light years
8
Q
What is a light year?
A
It is the distance light travel in one year (approximately 9500 billion km)
9
Q
How far is the nearest galaxy to the Milky Way?
A
2.2 million light-years away
