After World War II, the U.S. used these captured German rockets as atmospheric probes
One of Goddard's early inventions was developed into this anti-tank rocket gun
They're fired to slow down the movement of a space vehicle
A hydrate contains this compound weakly bound in its crystals
Of the 3 main classes of rock, this one is further divided into plutonic & volcanic types
The IRAS telescope, which discovered 5 comets, made its observations in this spectrum of light
This branch of medicine is concerned with the care & diseases of the elderly
Electrum is an alloy of these 2 precious metals
In 1982 the Jarvik-7, the first permanent one of these, was implanted in patient Barney Clark
Using a kite antenna, he received the first transatlantic wireless message in 1901, the letter S