General 20 Things About Light

2010.02.12 08:46

이한중*65 Views:6642

20 Things About Light - L.Keany

1. There was no light for half a million years after the Big Bang.

2. Those photons from the big bang are still running loose,
    detectable as the cosmic microwave background.

3. Light moves along at full speed at 186,282.4 miles per sec
    only in a vacuum. In a dense matrix of diamond it slows to
    just 77,500 miles per sec.

4. Diamond's dazzling sparkle results from a lot of pinging back
    and forth of the photons in a thicket of carbon atoms to
    find an exit.

5. Eyeglasses can correct vision because light changes speed
    when it passes from air to a glass or plastic lens;
    this causes the rays to bend.

6. Plato fancied that we see by shooting light rays
    from our eyes.

7. Plato was not completely wrong. Like all living things,
    humans are bioluminscent. We glow.
    We are brightest during the afternoon,
    around our lips and cheeks.
    The cause is believed to be due to
    free radicals resulting from
    chemical reactions of our body.

8. Bioluminscence is the largest source of light in the oceans;
   90 percent of all creatures
   who live below 1500 feet are luminous.

9. World War 2 aviators used to spot ships
    by the bioluminscence in their wakes.
    In 1954 Jim Lovell(later the pilot of Apollo 13)
    used this trick to find his darkened aircraft carrier.

10. Incandescent bulbs convert only 10%
    of the energy they draw into light,
    which is why Europe will outlaw them by 2012.
   Most of the electricity turns into unwanted heat.

11. In a confined space of oven, a 100 watt bulb can create a
   temperature of 325 degrees Fahrenheit.

12. Light has no mass, but it does have momentum.
   Later this year the Planetary Society will launch Lightsail-1,
   attempting to capture the pressure of sunlight the way a boat
   sail gathers the wind.

13. Laser beams bounced off mirrors left behind
   by Apollo austronauts show that
   the moon is moving away 1.5 inches farther from Earth
   each year.

14. Visible light makes up less than one ten-billionth of
   the electromagnetic spectrum from radio waves
   to gamma rays.

15. Goldfish can see infrared radiation
   that is invisible to us.
   Bees, birds, and lizards have eyes that pick up ultraviolet.

16. Photography means "writing with light."
   English astronomer John Herschel,
   whose father discovered infrared,
   coined the term.

17. Just after sunrise and before sunset produces
   the prettiest shadows
   and colors for photographs.

18. Day and night are everywhere the same length
   on the vernal equinox,
   which occurs on March 20.

19. Auroras light up the night sky when
   solar wind particles excite atoms
   in the upper atmosphere.
   Oxygen shines green; nitrogen blue and red.

20. But to the Inuits, auroras are spirits of the dead
   kicking around the head of a walrus.

from the magarzine, "DISCOVER," March, 2010

I want to

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Comment 2

이한중*65

2010.02.12 08:52

Einstein was quoted as saying, "Curiosity itself is good enough reason to live."
As we get older, I feel that it is a good advice and
decided to put these science facts on our page to stimulate our curiosity once again.

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방준재*70

2010.02.12 19:39

Aurora, mysterious, but it tells a lot of things,
about you, about ne, and about everybody.

We carry our own aurora by which we reveal ourselves.
And someone can feel it and read what it is.

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General 20 Things About Light

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