Space agencies
Here are some links to some of the main space agencies worldwide. Do please post any which I've missed.
NASA:
http://www.nasa.gov/
European Space Agency:
http://www.esa.int/esaCP/index.html
Russian Federal Space Agency:
http://www.roscosmos.ru/index.asp?Lang=ENG
China National Space Administration:
http://www.cnsa.gov.cn/n615709/cindex.html
Indian Space Research Organisation:
http://www.isro.org/
NASA:
http://www.nasa.gov/
European Space Agency:
http://www.esa.int/esaCP/index.html
Russian Federal Space Agency:
http://www.roscosmos.ru/index.asp?Lang=ENG
China National Space Administration:
http://www.cnsa.gov.cn/n615709/cindex.html
Indian Space Research Organisation:
http://www.isro.org/