What people are saying - Write a review
We haven't found any reviews in the usual places.
Spheres within Spheres
Is Our Universe Unique?
22 other sections not shown
Other editions - View all
21 centimeters Academy of Sciences acids antenna Arecibo argued astronomers atmosphere atoms bacteria carbon carbonaceous chondrites Carl Sagan century civilization clouds Cocconi comets communication detected discovery dish distance dust earth electrons emissions energy Epsilon Eridani evolution evolved extraterrestrial formed Frank Drake frequency galaxy Green Bank Harvard Hoyle human hydrogen idea infrared Institute intelligent interstellar Jupiter Laboratory laser later light Mars Martian material megahertz Melvin Calvin meteorites miles million mirror molecules moon Morrison motion NASA National Nature nebula objects Observatory observed optical orbit organisms Orgueil Orgueil Meteorite origin Otto Struve Ozma panspermia Philip Morrison planetary planets pointed possible produced Project Ozma proposed pulses radar radiation radio astronomy radio telescope radio waves Research rotating scan scientific scientists seemed SETI Shapley signals Society solar system Soviet space spacecraft spectrum sphere spin stars Struve surface tion University Urey wavelength worlds wrote York