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?

---

Definitions:

Civil War

A conflict between different factions or regions within the same country, often characterized by intense military engagements.

New Deal

A series of programs, public work projects, financial reforms, and regulations enacted by President FDR in the United States during the 1930s to help recover from the Great Depression.

1960s

A decade marked by social change, political upheaval, and significant cultural developments, occurring from 1960 to 1969.

Dual Federalism

The political concept where state governments and the federal government have clearly defined and separate areas of authority and responsibility.