sources

The Earth Impact Database http://www.unb.ca/passc/ImpactDatabase/Hawaii

Space Grant College http://www.soest.hawaii.edu/SPACEGRANT/class_acts/

David J. Heather and Sarah K. Dunkin, 1999, Mars in the Classroom. http://www.star.ucl.ac.uk/~rpif/mitc/mitchome.html

Near Earth Object Program. NASA http://neo.jpl.nasa.gov/index.html

Walter S. Kiefer, 2003, Impact Craters in the Solar System. Space Science Reference Guide, Second Edition, Lunar and Planetary Institute.

Relic of ancient asteroid found. Rebecca Morelle, BBC News science reporter.
A large fragment of an asteroid that punched 160km-wide (100 miles) hole in the Earth's surface has been found.The beachball-sized fossil meteorite was dug out of the 145-million-year-old Morokweng crater in South Africa. http://news.bbc.co.uk/2/hi/science/nature/4757545.stm

Elizabeth E. Roettger, 1998, Impact experiment http://www.nthelp.com/eer/impacts.html

Comet In Southern Germany, 200 BC http://www.spacedaily.com/news/comet-04l.html

Mehr als 80 Meteoritenkrater rund um den Chiemsee entdeckt http://www.uni-protokolle.de/nachrichten/id/90028/  

Physics of Fluids Group, University of Twente, the Netherlands http://pof.tnw.utwente.nl/

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