Amazing Space Q&A by Mike Goldsmith

By Mike Goldsmith

Every little thing you by no means knew approximately space!Amazing house Q&A explores the ultimate frontier, from cosmic dirt to great mammoth stars. Bursting with eye-opening questions and revealing solutions, the ebook tells inform you every thing you ever desired to learn about the universe (but have been afraid to ask!).

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It is thought that the dust seen in many galaxies is produced in the atmospheres of red giants and other ancient stars. The Sombrero Galaxy has a thick ring of dust around it, and our own galaxy also contains many dust clouds; the dust particles that make up these regions are usually either like tiny pieces of soot or very fine sand. A More Facts ■ The Andromeda Galaxy is often referred to as M31, because it was the thirty-first entry in French astronomer Charles Messier’s catalog. Messier published his list of what we now know to be deep-sky objects in 1774.

87 days Algol A, a hot bright star Q Can a star vary in brightness? A Many stars vary in brightness over Algol B, a cool reddish star hours, days, or years, and are called variables because of this. ” Algol is actually a pair of stars in orbit around each other. As each star passes in front of the other, it blocks some of its companion’s light, causing the brightness variations we can see. More Facts Gliese 581, a red dwarf star in the constellation of Libra Q What is a red dwarf? Red dwarfs are the most A common type of star in the known Universe.

Matter that falls into them gives up some of its energy in the form of powerful radiation, which astronomers can detect in the form of X-rays. There are also sudden bursts of gamma rays (an even more powerful type of radiation) caused by a star collapsing and forming a new black hole. 46 Stephen Hawking ■ It used to be thought that black holes produced no radiation at all, but physicist Stephen Hawking showed that they are surrounded by a faint glow now called Hawking radiation. ■ Although the idea of black holes was first suggested in 1783, it was not taken seriously until the work of Albert Einstein and other scientists in the 20th century proved they might exist.

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