Students for the Exploration and Development of Space

http://www.seds.org/

The Nine (actually, now eight) Planets

http://seds.lpl.arizona.edu/nineplanets/nineplanets/

Zodiacal Light by Dominic Cantin

http://www.pbase.com/dominiccantin/astrophoto

http://www.pbase.com/dominiccantin/image/41626600

International Astronomical Union Minor Planet Center

http://www.cfa.harvard.edu/iau/mpc.html

http://www.cfa.harvard.edu/iau/lists/Lists.html

http://www.cfa.harvard.edu/iau/lists/InnerPlot.html

neos

http://neo.jpl.nasa.gov/

interactive neo orbit display (approximation)

http://neo.jpl.nasa.gov/orbits/

asteroid 1997 XF11

http://cfa-www.harvard.edu/iau/pressinfo/1997XF11.html

known near misses by asteroids

http://cfa-www.harvard.edu/iau/lists/Closest.html

known near misses by comets

http://cfa-www.harvard.edu/iau/lists/ClosestComets.html

Forthcoming Close Approaches To The Earth

http://cfa-www.harvard.edu/iau/lists/CloseApp.html

http://www.cfa.harvard.edu/iau/lists/PHACloseApp.html

http://neo.jpl.nasa.gov/ca/

http://www.unb.ca/passc/

http://www.unb.ca/passc/ImpactDatabase/

http://www.unb.ca/passc/ImpactDatabase/essay.html

http://www.unb.ca/passc/ImpactDatabase/essayimages/nucwin.gif

the Torino Scale - impact hazard

http://en.wikipedia.org/wiki/Torino_scale

Meteorite and Impacts Advisory Committee --> Chicxulub

http://miac.uqac.ca/MIAC/chicxulub.htm --> grav-3.jpg

SPACEGUARD URLs

http://neo.jpl.nasa.gov/programs/

how to divert a NEO?

http://www.b612foundation.org/papers/AT-GT.pdf

http://antwrp.gsfc.nasa.gov/apod/ap051110.html

Lincoln Near-Earth Asteroid Research (LINEAR)

http://www.ll.mit.edu/LINEAR/

Near-Earth Asteroid Tracking (NEAT)

http://neat.jpl.nasa.gov/

Spacewatch

http://pirlwww.lpl.arizona.edu/spacewatch/

Lowell Observatory Near-Earth Object Search (LONEOS)

http://asteroid.lowell.edu/asteroid/loneos/loneos.html

Catalina Sky Survey

http://www.lpl.arizona.edu/css/

http://msowww.anu.edu.au/~rmn/

Japanese Spaceguard Association (JSGA)

http://www.spaceguard.or.jp/ja/index.html

Asiago DLR Asteroid Survey (ADAS)

http://planet.pd.astro.it/planets/adas/index.html

http://dipastro.pd.astro.it/planets/adas/

home page

http://spaceguard.esa.int/

Precovery research

http://spaceguard.esa.int/SSystem/SSystem.html

Tumbling Stone electronic magazine

http://spaceguard.esa.int/tumblingstone/index.html

Google Directory http://www.google.com/Top/Science/Earth_Sciences/Geology/Geomorphology/Impact_Craters/

interactive Impact Calculator

http://janus.astro.umd.edu/astro/impact/

introduction to Impact Effects Calculator

http://www.astrobio.net/news/print.php?sid=920

interactive Impact Effects Calculator

http://www.lpl.arizona.edu/impacteffects/

NASA - asteroid and comet impact hazards - http://impact.arc.nasa.gov/