en
Bøger
Marcus Chown

Infinity in the Palm of Your Hand

    Erickahar citeretsidste måned
    in fact all creatures that share the earth today – have a common ancestor
    Erickahar citeretsidste måned
    YOU, ME, all of us share a third of our DNA with fungi
    Erickahar citeretsidste måned
    the fact that, if you squeezed all the empty space out of all the people in the world, you could fit the human race in the volume of a sugar cube
    Erickahar citeretsidste måned
    put together some of the most mind-blowing scientific facts I have discovered over the years
    Ian Copplehar citeretfor 3 år siden
    The electrons in an atom are arranged in ‘shells’, each with a maximum complement of electrons. Having a complete shell is hugely desirable for an atom. Hydrogen can achieve this by losing an electron (in fact, its only electron); oxygen by gaining two electrons. This is why an oxygen atom grabs electrons from two hydrogen atoms
    Ian Copplehar citeretfor 3 år siden
    A cell is a tiny bag of gloop with the complexity of a small city. It is the ‘atom of biology’. All organisms are assemblages of cells. As far as we know, there is no life at all except cellular life
    Ian Copplehar citeretfor 3 år siden
    Every random quantum event since the Big Bang has injected information into the universe
    Ian Copplehar citeretfor 3 år siden
    physicists discovered that light is a stream of tiny machine-gun bullets called photons – all identical. After all, if they are all identical, surely they should be affected identically by a window pane? Either they should all go through or they should all be reflected
    Ian Copplehar citeretfor 3 år siden
    you can also see a faint reflection of your face. The reason is that glass is not perfectly reflecting. About 95 per cent of light goes through and about 5 per cent is reflected back
    Ian Copplehar citeretfor 3 år siden
    Everything comes in quanta – indivisible grains that cannot be cut any smaller: matter, energy, even space
    Ian Copplehar citeretfor 3 år siden
    Gravitational waves are produced whenever mass is accelerated. Wave your hand in the air. You just generated gravitational waves. They are spreading outwards like ripples on a lake
    Ian Copplehar citeretfor 3 år siden
    Ladies and gentlemen, we did it. We have detected gravitational waves.’
    David Reitze, 11 February 2016
    Ian Copplehar citeretfor 3 år siden
    in all everyday circumstances, pressure can be completely ignored as a source of gravity
    Ian Copplehar citeretfor 3 år siden
    Yes, the source of gravity is energy – or more specifically, energy density, or how concentrated that energy is – but the source is not energy alone: it is energy + pressure
    Ian Copplehar citeretfor 3 år siden
    there are other types of energy – electrical energy, light energy, chemical energy, energy of motion, sound energy, and so on – and all of them have gravity.
    Ian Copplehar citeretfor 3 år siden
    The source of gravity in Isaac Newton’s theory is mass. However, in the theory that supplanted Newton’s – Einstein’s theory of gravity, or the general theory of relativity – it is actually energy. Mass-energy turns out to be merely nature’s most compact form of energy
    Ian Copplehar citeretfor 3 år siden
    GRAVITY IS A UNIVERSAL FORCE THAT ACTS BETWEEN every chunk of matter and every other chunk of matter. There is a force of gravity, for instance, between you and the coins in your pocket
    Ian Copplehar citeretfor 3 år siden
    Remarkably, 99.9 per cent of the particles of light, or photons, in the universe are tied up in the heat afterglow of the Big Bang and only 0.1 per cent of them are photons from stars and galaxies
    Ian Copplehar citeretfor 3 år siden
    the heat of the Big Bang had nowhere to go. It was bottled up in the universe, which, by definition, is all there is. Consequently, the heat of the Big Bang is still around us today. It has been greatly cooled by the expansion of the universe in the past 13.82 billion years, so it no longer appears as light visible to the eye but as a type of invisible light known as microwaves.2
    Ian Copplehar citeretfor 3 år siden
    Dark matter and dark energy comprise about 95 per cent of the mass-energy content of the universe, yet we have only ideas about what they are
fb2epub
Træk og slip dine filer (ikke mere end 5 ad gangen)