Twin City Amateur Astronomers

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Associations
TCAA Forum Astronomical League NCRAL International Dark-Sky Association NASA Night Sky Network TCAA page on NASA Night Sky Network
Other Astronomy Clubs
Decatur Area Astronomy Club Peoria Astronomical Society Popular Astronomy Club Sangamon Astronomical Society Twin City Amateur Astronomers
Excellent Sites
NASA News Sugar Grove Nature Center Clear Sky Chart SkyMaps.com USNO Data Services GOES Satellite Server Space Weather

Hubble Space Telescope image: Hubble finds dark matter ring in galaxy cluster
 
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