If there was no Sun what the temperature of Earth would be?

3 degees K same as the average temperature of the universe (-454.27 degrees F).

At this temperature, the co2 in the air would be frozen to ice and the nitrigen in the air would become liquid (dip a freshly picked rose into liquid nitrogen for less than 1 second and then drop it on a table, the rose will shatter like glass!)

Planet's sometimes escape from the star they orbit (if they have a highly eccentric orbit or if the star losses some of its mass). These are called rogue planets. If this were to happen to earth, the earth's surface temperature would lower to below the freezing point of water; however underwater volcanoes produced from geothermal energy would persist for long periods of time which would prevent all of the oceans from freezing. If a planet without a molten radioactive core like earth (like mars which has a solid core) were to be flung out into the interstellar void, it would completely freeze over and its temperature would lower to below -200 C.

hope this helps :)

Probably the temperature of the interstellar space medium, 10 Kelvin

If the sun suddenly disappeared the atmosphere would condense and fall to the ground and the surface temp would hover just a bit above absolute zero.

If there was no sun, there would be no Earth

Close to absolute zero(-459). Probably around -455 degrees.

It'd be colder than anything you've ever known and there wouldn't be any life here.

Well with cars and factories it would be a normal temp. because when there is sun and cars produces heat by global warming but when there is no sun but there are cars and factories that produces Carbon Dioxide it can heat up the earth, by normal temperature. hope i would help you.