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Evidence of Things Unseen: Why Not Dark Matter?

By Johnson, Les

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Book Id: WPLBN0003548815
Format Type: PDF eBook :
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Reproduction Date: 2014

Title: Evidence of Things Unseen: Why Not Dark Matter?  
Author: Johnson, Les
Language: English
Subject: Nonfiction, Astronomy, Science
Collections: Science Fiction Collection, Baen Library Collection
Publication Date:
Publisher: Baen Publishing Enterprises


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Johnson, L. (2013). Evidence of Things Unseen. Retrieved from

Description: Les Johnson describes what scientists have discovered about Dark Matter.

Summary: The velocities of stars orbiting the centers of galaxies, rather than decreasing as a function of distance as would the velocities of planets orbiting a star, remain constant out to the edge of the galaxy. Gravity bends space-time, causing light to focus when it passes by a massive object, allowing scientists to measure of the mass of the object bending the light in a process called Gravitation Lensing; The bending of light is much, much larger around celestial objects than expected. dark matter.

Excerpt: Scientists now believe that dark matter accounts for about 84 percent of the matter in the universe. In other words, when you look into the sky and add up the mass of the planets, the Sun, all the stars (many of which, we now know, have planets circling them), the black holes, pulsars and quasars you will have only accounted for about 16% of the mass that should be there – if our understanding of gravity and its effects are correct. Something different (not made of protons, neutrons, electrons and their subatomic constituents) and unseen appears to be here with us normal matter types. We cannot see it, hear it or touch it, but we can see its effects just as we can see the effects of magnetism and radiation – though we cannot see them directly either.

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