Of the 3 main classes of rock, this one is further divided into plutonic & volcanic types
A hydrate contains this compound weakly bound in its crystals
Electrum is an alloy of these 2 precious metals
In 1611 Johannes Kepler introduced a second convex lens, giving this instrument greater power
Life here was the subject of the 1965 book "World Without Sun"
After 1,400 orbits it fell back to Earth January 4, 1958 & burned up
Inventors of these include Georges Leclanche, Gaston Plante & Alessandro Volta
In 1982 the Jarvik-7, the first permanent one of these, was implanted in patient Barney Clark
The 1st automated instrument to analyze this genetic material's structure was developed in the mid-1980s
Buckminster Fuller used "energetic synergetic geometry" to build these structures