Lecture 34 – Galaxies and the Universe. Repeatedly said there are other galaxies. Now details Large Magellanic Cloud (satellite to Milky Way) . Distance=50 kpc. Pic: http://antwrp.gsfc.nasa.gov/apod/ap010804.html M31: Distance=730 kpc, Pic: http://antwrp.gsfc.nasa.gov/apod/ap021021.html
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These are the closest galaxies
Question: How do we know their distances?
Our Galactic Neighborhood- The Local Group
Galaxies come in clusters, too
A new unit, the Megaparsec
Types of Galaxies
Spirals, Ellipticals, Irregulars
Now the question: how can you know the distances to these objects?
You can’t see Cepheids that far out
The Hubble Relation for Galaxies
If you measure the redshift, you know the distance