We wouldn't be alive if there were no sun.
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Here is an answer that I gave for a similar question. It may help:
If the Sun disappeared suddenly (don't ask how), people on Earth would not know of it for about eight minutes and nineteen seconds.
~ The affects of gravity travels at the speed of light so after 3.22 minutes Mercury would cease following an orbital path and continue on in a straight line into deep space. Also at that time the last rays of sunlight will have reached that planet and it would go dark.
The same thing would happen to Venus after 6.01 minutes and Earth after 8.32 minutes. One after another, the planets of our solar system would receive their last rays from the Sun and sail away at whatever pace they were previously moving. The same thing would happen to all other parts of our solar system, including asteroids, comets and debris in the Kuiper belt and Oort cloud.
Cooling:
~ Earth normally experiences darkness half of each day and cools several tens of degrees. Now it would also cool during the other half so surface cooling is twice as rapid.
~ Within the first two days the air temperature would be so low that no moisture could remain in it. Without clouds the Earth's heat would radiate away more quickly.
~ Within four days all the Earths greenhouse gasses (water vapor, carbon dioxide, methane, nitrous oxide and ozone) in the atmosphere would have turned into a liquids and solids speeding the cooling even more.
Within one week all land areas would be frozen at least to a depth of 10 to 20 feet. The land would eventually freeze to a depth of about 1/3 to 2/3 of a mile. Except for the deepest areas, the oceans would freeze miles deep in less than a year. Near the ocean floor the water may not freeze because of Earth's internal heat.
Most animal and plant life would die when the atmosphere liquefies. Some life would possibly continue deep in the Earths crust (up to five miles) although the habitable zone may change dramatically and those life forms would not be capable of moving to better climes.
If the Sun disappeared suddenly (don't ask how), people on Earth would not know of it for about eight minutes and nineteen seconds.
~ The affects of gravity travels at the speed of light so after 3.22 minutes Mercury would cease following an orbital path and continue on in a straight line into deep space. Also at that time the last rays of sunlight will have reached that planet and it would go dark.
The same thing would happen to Venus after 6.01 minutes and Earth after 8.32 minutes. One after another, the planets of our solar system would receive their last rays from the Sun and sail away at whatever pace they were previously moving. The same thing would happen to all other parts of our solar system, including asteroids, comets and debris in the Kuiper belt and Oort cloud.
Cooling:
~ Earth normally experiences darkness half of each day and cools several tens of degrees. Now it would also cool during the other half so surface cooling is twice as rapid.
~ Within the first two days the air temperature would be so low that no moisture could remain in it. Without clouds the Earth's heat would radiate away more quickly.
~ Within four days all the Earths greenhouse gasses (water vapor, carbon dioxide, methane, nitrous oxide and ozone) in the atmosphere would have turned into a liquids and solids speeding the cooling even more.
Within one week all land areas would be frozen at least to a depth of 10 to 20 feet. The land would eventually freeze to a depth of about 1/3 to 2/3 of a mile. Except for the deepest areas, the oceans would freeze miles deep in less than a year. Near the ocean floor the water may not freeze because of Earth's internal heat.
Most animal and plant life would die when the atmosphere liquefies. Some life would possibly continue deep in the Earths crust (up to five miles) although the habitable zone may change dramatically and those life forms would not be capable of moving to better climes.
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