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Determining the Extragalactic Distance Scale
written by Diane Dutkevitch
In this activity students find a number of Cepheid variables in the galaxy M100.  They then use their periods, average apparent magnitudes, and their Period-Luminosity relationships, in order to determine the distance to M100.  Then students can estimate the Hubble constant to find the age of the universe.
http://astro.wku.edu/labs/m100/
Subjects Levels Resource Types
Astronomy
- Cosmic Time and Distance
= Cepheids
= Distance Scales
- Cosmology
- Fundamentals
- Stars
- Lower Undergraduate
- Upper Undergraduate
- Instructional Material
= Activity
= Laboratory
- Reference Material
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- Learners
- text/html
- image/jpeg
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Keywords:
M100, age of the universe, cepheid variables, distances, galaxies, hubble constant, magnitudes, period luminosity
Record Creator:
Metadata instance created January 20, 2004 by Patricia Monahan
Record Updated:
November 20, 2009 by Lyle Barbato
Other Collections:

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AIP Format
D. Dutkevitch, , WWW Document, (http://astro.wku.edu/labs/m100/).
AJP/PRST-PER
D. Dutkevitch, Determining the Extragalactic Distance Scale, <http://astro.wku.edu/labs/m100/>.
APA Format
Dutkevitch, D. (n.d.). Determining the Extragalactic Distance Scale. Retrieved May 1, 2025, from http://astro.wku.edu/labs/m100/
Chicago Format
Dutkevitch, Diane. Determining the Extragalactic Distance Scale. http://astro.wku.edu/labs/m100/ (accessed 1 May 2025).
MLA Format
Dutkevitch, Diane. Determining the Extragalactic Distance Scale. 1 May 2025 <http://astro.wku.edu/labs/m100/>.
BibTeX Export Format
@misc{ Author = "Diane Dutkevitch", Title = {Determining the Extragalactic Distance Scale}, Volume = {2025}, Number = {1 May 2025}, Year = {} }
Refer Export Format

%A Diane Dutkevitch %T Determining the Extragalactic Distance Scale %U http://astro.wku.edu/labs/m100/ %O text/html

EndNote Export Format

%0 Electronic Source %A Dutkevitch, Diane %T Determining the Extragalactic Distance Scale %V 2025 %N 1 May 2025 %9 text/html %U http://astro.wku.edu/labs/m100/


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The AIP Style presented is based on information from the AIP Style Manual.

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