Astronomy today by Isaac Asimov

By Isaac Asimov

How do astronomers do their paintings this present day? during this ebook, Isaac Asimov bargains an up to date account of stargazing at the present time, from the most recent technological advances in house telescopes, desktops, and radio telescopes to the straightforward act of observing skyward on a starry evening with binoculars and pencil and paper in hand. here's a attention-grabbing array of astronomers’ equipment, gear, and ideas.

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To L. Fizeau IJS19-1396), French scientist: in 1S4> used -how whether an object was moving toward (red shift) us (violet shift) or a spectroscope away from us and how fast Annie lump Cannon 1863-1941 V ( US astronomer used spectrographic methods to classify -tar- in orders ot decreasing temperature. Wilhelm Wien (1864-1928), German Vesto show Melvm Slipher a red shift, ( Invisible lS75-19(y}). meaning contributed toward the The scientist: used the spectrum to measure temperature-. -tronomer: discovered that most galaxies moving away from Bang" theorv us.

For example, by examining the light of a distant galaxy with a special tool called a spectroscope, astronomers can figure out whether that galaxy is moving away from us or toward us and how fast. Light waves of a body coming toward us are shorter, and move, or shift, toward the violet end of the spectrum. Light waves of a body moving away from us are longer, and shift toward the red end of the spectrum. So when Isaac Newton explained the visible spectrum violet, blue, green, yellow, orange, and red he opened the door to a whole new way of observing the Universe.

Tronomer: discovered that most galaxies moving away from Bang" theorv us. of the birth ot the This discovery Univer-e. — Red End William Herschel (1738-1822), German-born English astronomer: discovered infrared radiation by measuring heat beyond the red end ot the spectrum and getting a higher temperature reading. Thi- led to the conclusion that there must infrared that he couldn't -ee. have been a line beyond red — — Heinnch Rudolph Hert: (1857-1894), German much Karl longer than infrared radiation Guthe Jan-kv { N05-1 Q 50), L'S scientist: — radio waves.

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