By Charles Liu PhD
From planetary routine and the exploration of our sun approach to black holes and darkish subject, this complete reference simplifies all points of astronomy with an approachable question-and-answer structure. With chapters damaged into quite a few astronomical studies—including the universe, galaxies, planets, and area exploration—this source is a perfect significant other for college students, academics, and beginner astronomers, answering greater than 800 questions, corresponding to Is the universe countless? What might take place to you in the event you fell onto a black gap? What are the fundamental innovations of Einstein's distinct concept of relativity? and Who used to be the 1st individual in area?
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Additional info for The Handy Astronomy Answer Book (The Handy Answer Book Series)
Example text
Matter, the stuff out of which every object in the universe is made, is everything in the universe that has mass. Mass is a quality that is hard to describe. Very roughly, it is the “drag” through spacetime that an object experiences. An object with more mass will move more slowly through spacetime than an object with less mass, if both have the same amount of either momentum or kinetic energy. What is the significance of the formula E = mc2? E ϭ mc2 was discovered by Albert Einstein in 1905. It is a major result of his Special Theory of Relativity, which describes the relationship between how objects and electromagnetic radiation move through space and how they move through time.
F objects traveling at different speeds through space will experience the passage of time differently, then it is possible to imagine a situation in which a pair of identical twins could wind up as two people of different ages. If one of the twins were placed on a fast-moving vehicle at birth, and the other twin were to stand relatively still, then they would age at different rates. ” I What are X rays? X rays are electromagnetic waves whose wavelengths range between about 10–9 and 10–8 (one ten-billionth and one hundred-millionth) of a meter.
If the source is moving toward the listener, the sound wave’s wavelength decreases, and the frequency increases, making the sound higher-pitched. Conversely, if the source is moving away from the listener, the sound wave’s wavelength increases, and the frequency decreases, making the sound lower-pitched. The next time a car or train passes by you on the street, listen to the sound it is making as it approaches and then moves away. N about 73 kilometers per second per megaparsec. That means that, if a location in space is one million parsecs from another location, then in the absence of any other forces or effects the two locations will be moving apart from one another at the speed of 163,000 miles (263,000 kilometers) per hour.