Dark Matter and Dark Energy: The Hidden 95% of the Universe by Brian Clegg

Dark Matter and Dark Energy: The Hidden 95% of the Universe
Brian Clegg
Page: 176
Format: pdf, ePub, mobi, fb2
ISBN: 9781785785696
Publisher: Icon Books, Ltd. UK
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Downloading books to ipod free Dark Matter and Dark Energy: The Hidden 95% of the Universe (English literature)

All the matter and light we can see in the universe makes up a trivial 5
 per cent of everything. The rest is hidden. This could be the biggest puzzle that science has ever faced. Since the 1970s,
 astronomers have been aware that galaxies have far too little matter in them to
 account for the way they spin around: they should fly apart, but something concealed holds them together. That ’something' is dark matter – invisible
 material in five times the quantity of the familiar stuff of stars and planets. By the 1990s we
 also knew that the expansion of the universe was accelerating. Something, named
 dark energy, is pushing it to expand faster and faster. Across the universe,
 this requires enough energy that the equivalent mass would be nearly fourteen
 times greater than all the visible material in existence. Brian Clegg explains
 this major conundrum in modern science
 and looks at how scientists are beginning to find solutions to it.

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