The Astronomy Book
ATOMS, STARS, AND GALAXIES 199 heavier elements such as iron and carbon could form: the cores of stars were not considered hot e ...
200 SITES OF STAR FORMATION DENSE MOLECULAR CLOUDS IN CONTEXT KEY ASTRONOMER Bart Bok (1906–1983) BEFORE 1927 American astronome ...
201 See also: Space telescopes 188–95 ■ Inside giant molecular clouds 276–79 ■ Ambartsumian (Directory) 338 ATOMS, STARS, AND GA ...
NEW WIN DOWS ON THE U NIVERSE 1950 –1975 ...
NEW WIN DOWS ON THE U NIVERSE 1950 –1975 ...
204 T he launch in 1957 by the Soviet Union of the first artificial Earth satellite, Sputnik 1, was a turning point in history, ...
205 emissions from the hydrogen gas that pervades interstellar space. This discovery allowed the spiral structure of our galaxy ...
206 See also: Halley’s comet 74–77 ■ The Kuiper belt 184 ■ The composition of comets 207 ■ Exploring beyond Neptune 286–87 I n 1 ...
207 See also: Halley’s comet 74–77 ■ Asteroids and meteorites 90–91 ■ Astrophotography 118–19 ■ The Kuiper belt 184 T he arrival ...
208 THE WAY TO THE STARS IS OPEN THE LAUNCH OF SPUTNIK IN CONTEXT KEY ASTRONOMER Sergei Korolev (1907–1966) BEFORE 1955 The US a ...
209 See also: The Space Race 242–49 ■ Exploring the solar system 260–67 ■ Exploring Mars 318–25 NEW WINDOWS ON THE UNIVERSE of t ...
210 THE SEARCH FOR INTERSTELLAR COMMUNICATIONS RADIO TELESCOPES IN CONTEXT KEY ASTRONOMERS Giuseppe Cocconi (1914 –2008) Philip ...
NEW WINDOWS ON THE UNIVERSE 211 societies may already be trying to make contact. The pair suggested looking for signals in the m ...
212 See also: Asteroids and meteorites 90–91 ■ The discovery of Ceres 94–99 ■ The composition of comets 207 S o great was the co ...
213 See also: The properties of sunspots 129 ■ The Homestake experiment 252–53 ■ Exoplanets 288–95 I n 1960, American physicist ...
214 THE DATA CAN BEST BE EXPLAINED AS X-RAYS FROM SOURCES OUTSIDE THE SOLAR SYSTEM COSMIC RADIATION X -rays are a form of high- ...
215 See also: The Homestake experiment 252–53 ■ Discovering black holes 254 X-rays can cause damage and mutations when they impa ...
216 the X-ray signals, by contrast, radiated a thousand times more X-rays than light. Although a small, barely visible point in ...
217 Eager to probe the X-ray background further, Giacconi once again proposed an advanced telescope. In 1999, this became the Ch ...
218 BRIGHTER THAN A GALAXY BUT IT LOOKS LIKE A STAR UASARS AND BLACK HOLESQ B y the end of the 1950s, radio astronomy had given ...
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