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hyperphysics

Pulsar

Intriguing, precisely repeated radio pulses from the plane of our galaxy were discovered in the late 1960's and half-seriously attributed to "little green men" and called LGMs.

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http://hyperphysics.phy-astr.gsu.edu/hbase/astro/pulsar.html#c2
hyperphysics

Hubble's Law

Hubble's law is a statement of a direct correlation between the distance to a galaxy and its recessional velocity as determined by the red shift.

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http://hyperphysics.phy-astr.gsu.edu/hbase/astro/hubble.html#c1

Expanding Universe

An animation of the movement of galaxies as the universe expands.

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Hits: 1088

http://www.7stones.com/Homepage/Publisher/GR.html

The Hubble Heritage Project

Stunning picture gallery of the Hubble telescope's images of planets, nebulae and galaxies.

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http://heritage.stsci.edu/

Gas Disks

Images and text relating to the discovery of a massive black hole at the centre of the M87 Galaxy. Images from the Hubble Space Telescope are visible

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Hits: 1497

http://oposite.stsci.edu/pubinfo/pr/94/23.html

Redshift video

Excellent sixty symbols video explaining redshift (and blueshift) and how it used to determine the direction galaxies are travelling in.

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Hits: 1983

http://www.sixtysymbols.com/videos/redshift.htm

Kepler Mission

The official site for NASA's Kepler mission, on a quest to find habitable exoplanets in our galaxy.

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Hits: 1137

http://kepler.nasa.gov/

How far away is stuff?

Great explaining on how we measure distances to stars using parallax and distances to galaxies using Cepheid Variables stars.

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Hits: 165

http://scienceblogs.com/startswithabang/2013/04/24/how-far-away-is-stuff/

The Guide to Space & Astronomy

Leicester University's extensive guide to the solar system, the wider galaxy and space missions with lots of excellent photographs, illustrations and links

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Hits: 2323

http://www.star.le.ac.uk/edu/Index.shtml

Cepheid Variables as Cosmic Yardsticks

Cepheid Variables stars can tell astronomers how far away galaxies are.

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Hits: 26

http://imagine.gsfc.nasa.gov/docs/science/mysteries_l1/cepheid.html
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