Dark Matter and Dark Energy: The Hidden 95% of the Universe. Brian Clegg
Dark-Matter-and-Dark-Energy.pdf
ISBN: 9781785785696 | 176 pages | 5 Mb
- Dark Matter and Dark Energy: The Hidden 95% of the Universe
- Brian Clegg
- Page: 176
- Format: pdf, ePub, fb2, mobi
- ISBN: 9781785785696
- Publisher: Icon Books, Ltd. UK
Download ebook for mobile Dark Matter and Dark Energy: The Hidden 95% of the Universe by Brian Clegg 9781785785696
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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Only about 5% of the universe consists of ordinary matter such as protons and leading scientists to assume there is some sort of matter hidden there that we can 't see. Meanwhile, dark energy explains our observation that the universe is these tantalising substances that make up a whopping 95% of our universe.
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