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With the Hubble Space Telescope, You Discover a Cepheid Variable \odot

question 47

Essay

With the Hubble Space Telescope, you discover a Cepheid variable star in a nearby galaxy that has a period of 30 days. If nearby Cepheids follow a period-luminosity relationship that says the luminosity of the star is L =335 L \odot * (P/1 day), then what is this Cepheid's luminosity and absolute magnitude? Recall that the Sun's absolute magnitude is M = 5. If the apparent magnitude of the Cepheid is 25, what is this galaxy's distance in Mpc?

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Definitions:

Population

All the members or elements that are examined as part of a statistical study.

Driver's License Number

A unique numerical or alphanumeric code issued by a governmental authority that identifies a person's official driver's license.

Temperature

A physical quantity that expresses the subjective perceptions of hot and cold.

Scales Of Measurement

The systems used to categorize the nature of information that data provides, namely nominal, ordinal, interval, and ratio scales.

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