The Astronomy Book

239 of signals observed. Instead, it could be emitting a steady radio signal in a beam that it swept around in circles, just lik ...

240 GALAXIES CHANGE OVER TIME UNDERSTANDING STELLAR EVOLUTION IN CONTEXT KEY ASTRONOMER Beatrice Tinsley (1941–1981) BEFORE 1926 ...

241 See also: Measuring the universe 130–37 ■ The birth of the universe 168–71 ■ Beyond the Milky Way 172–77 ■ Nuclei and radiat ...

WE CHOOSE TO GO TO THE MOON THE SPACE RACE ...

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244 I n the early 1960s, the US lagged behind the Soviet Union in the “Space Race.” The Soviets had launched the first satellite ...

245 moon landing, many technological hurdles needed to be overcome. One of the first was the method of getting to the moon. Thre ...

246 astronaut, Apollo missions would need a crew of three. In addition, a more reliable power source was needed and much more ex ...

247 Even with 99.9 percent reliability, the engineers could anticipate 5,600 defects. Nevertheless, over its 17 unmanned and 15 ...

248 global audience of 500 million tuned in to watch Neil Armstrong land the Lunar Module and step out onto the surface of the m ...

249 scientific priorities changed, politicians worried about costs, and human space travel has not ventured farther than Earth’s ...

250 THE PLANETS FORMED FROM A DISK OF GAS AND DUST THE NEBULAR HYPOTHESIS IN CONTEXT KEY ASTRONOMER Viktor Safronov (1917–1999) ...

251 See also: Gravitational disturbances 92–93 ■ The Kuiper belt 184 ■ The Oort cloud 206 ■ Inside giant molecular clouds 276–79 ...

252 SOLAR NEUTRINOS CAN ONLY BE SEEN WITH A VERY LARGE DETECTOR THE HOMESTAKE EXPERIMENT IN CONTEXT KEY ASTRONOMER Ray Davis (19 ...

253 See also: Cosmic rays 140 ■ Energy generation 182–83 ■ Gravitational waves 328–31 NEW WINDOWS ON THE UNIVERSE scientists tho ...

254 See also: Supernovae 180–81 ■ Cosmic radiation 214–17 ■ Hawking radiation 255 B lack holes are invisible. They allow no matt ...

255 See also: Curves in spacetime 154–55 ■ The life cycles of stars 178 ■ The heart of the Milky Way 297 ■ Michell (Directory) 3 ...

THE TRI UMPH OF TECH NOLOGY 1975 –PRESENT ...

THE TRI UMPH OF TECH NOLOGY 1975 –PRESENT ...

258 M ost major discoveries in astronomy have been made possible by advances in technology. Recent developments have provided po ...