Cepheids can be used to calculate distance by:
adding absolute and apparent magnitude
finding the difference between absolute and apparent magnitude
measuring parallax angles
dividing radial velocity by distance

Cepheids:

brighten and dim periodically
can be used to measure stellar distance
have been discovered in galaxies other than our own
all of the above

Absolute magnitude _____.

is how bright a star appears from Earth
depends on luminosity and distance
is a measure of a star's actual brightness
is usually the same as apparent magnitude


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