A Brief History of TimeRandom House Publishing Group, 1998 M09 1 - 240 páginas #1 NEW YORK TIMES BESTSELLER |
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... effect , is an everyday experience . Listen to a car passing on the road : as the car is approaching , its engine sounds at a higher pitch ( corresponding to a shorter wavelength and higher frequency of sound waves ) , and when it ...
... effect . This can be done very accurately . However , the dis- tances to the galaxies are not very well known because we can only measure them indirectly . So all we know is that the universe is expand- ing by between 5 percent and 10 ...
... effect has been observed over the past few years occurring in the system called PSR 1913 + 16 ( PSR stands for " pulsar , " a special type of neutron star that emits regular pulses of radio waves ) . This system contains two neutron ...
Otras ediciones - Ver todas
A Brief History of Time: From the Big Bang to Black Holes Stephen Hawking,Carl Sagan Vista de fragmentos - 1990 |
Términos y frases comunes
Referencias a este libro
Qualitative Data Analysis: A User-friendly Guide for Social Scientists Ian Dey Sin vista previa disponible - 1993 |
Postmodern Public Administration: Toward Discourse Charles J. Fox,Hugh T. Miller Vista de fragmentos - 1995 |