The orbiting solar observatory studies the sun by measuring radiation that cannot get through the Earth's atmosphere. The orbiting astronomical observatory looks deep into space at stars and galaxies measuring rays that never reach Earth. The U.S. builds and launches some scientific satellites in cooperation with other countries. The first international satellite, Ariel, carried instruments built by British scientists. The topsider sounder, Alouette, was designed and built by Canadian engineers and launched by the U.S. Military satellites are used for communication and navigation.
Reconnaissance satellites can photograph enemy ground forces.
Warning satellites can guard against surprised missile attacks. They can discover a missile launch by measuring the heat of the missile rocket exhaust. If you have comments or other information relating to such topics as this paper covers, please upload to KeelyNet or send to the Vangard Sciences address as listed on the first page. Thank you for your consideration, interest and support.