1
Q
How do we measure distance in space
A
Shoot radar beams at planets and see how long it takes for the reflection to arrive
2
Q
What are variable stars
A
Stars that vary in brightness
3
Q
What are cepheids
A
Large yellow pulsating variable stars
4
Q
What are rrlyrae
A
Slightly smaller pulsating stars
5
Q
Do cepheids or rrlyrae stars have the same luminosity
A
Rrlyrae
6
Q
Who discovered period luminosity relation
A
Henrietta swanleavitt
Astronomy
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