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Galaxy Photometry

Information about galaxies and their brightness. Using images of three spiral galaxies to measure galaxy flux.

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Seyfert Galaxies

The key to classifying a galaxy as a Seyfert Galaxy is the presence of broad emission lines from the bright, star-like nucleus. They are often strong radio and infrared sources. The first such active ...

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Galaxy Zoo

Take part in real astronomy research by joining this public project classifying galaxies and taking part in citizen science.

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How to Map a Galaxy When You’re Right in the Middle of It

How to draw a map of the galaxy as if viewing it from the outside.

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How to weigh a galaxy cluster

Four ways to measure how much stuff there is in a galaxy cluster.

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Martin Rees

Martin Rees (1942 - ) has made important contributions to the theories of galaxy formation, galaxy clustering, and the origin of the cosmic background radiation.

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Planetquest - 3D Guide to the Galaxy

Explore the milky way in 3D

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How old do I look?

A fun game to try to see if you can tell what's older just by looking at it, and how we can tell the age of galaxies from the light they emit.

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A Guide to the Center of the Milky Way

A visual tour of our galaxy.

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The Hubble Law

Measuring the red shift for several galaxies from spectral lines.

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