Earth Sciences
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What would happen to Earth if there were no light?

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2010-06-11 16:09:07

"Earth_Without_Light" id="Earth_Without_Light">Earth Without


Presuming the question is about what happens if the sun, our

principal source of light, suddenly disappeared, what follows is a

scientifically credible answer:

Without sunlight, plants die, then animals die.

Without sunlight earth's atmosphere cools.

Note that the Earth does not immediately freeze. The Earth's

interior contains many radioactive elements and as they decay the

heat released will keep the interior warm for a long time to come.

The surface, however, will rapidly radiate heat into space, and

fall to the temperature of the solar system's outer planets.

Earth's oceans contain considerable latent heat, these would

require months or years to freeze solid. The ocean surfaces would

begin freezing from the poles towards the equator within a matter

of weeks.

Grass and trees would begin dying within days. Pine trees would

last among the longest as these can remain buried beneath ice for

months at a time. Water would precipitate out of the atmosphere,

making the air very dry and cold.

If the sun went missing altogether, which is the source of

gravity holding the solar system together, the planets, including

Earth would fly off in straight lines until ultimately interacting

with some other massive body millions of years hence.

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