why the outer space is old of the sun's radiation is still there....but with the same radiation on planets make them hot.. whereas the space is cold???
Answers
Heat travels through the cosmos as radiation, an infrared wave of energy that migrates from hotter objects to cooler ones. The radiation waves excite molecules they come in contact with, causing them to heat up. This is how heat travels from the sun to Earth, but the catch is that radiation only heats molecules and matter that are directly in its path. Everything else stays chilly. Take Mercury: the nighttime temperature of the planet can be 1,000 degrees Fahrenheit lower than the radiation-exposed day-side, according to NASA.
Answer:
So even when the sun heats them with infrared waves, transferring that heat via conduction isn't possible. Similarly, convection—a form of heat transfer that happens in the presence of gravity—is important in dispersing warmth across the Earth, but doesn't happen in zero-g space.