What is the phenomenon that allows the sun's heat to pass through to the Earth's surface while stopping it from spreading back into space?

Question

Quizplus · Accepted Answer

The greenhouse effect is the phenomenon whereby certain gases in the Earth's atmosphere trap heat from the sun, allowing it to warm the planet's surface. This heat is then radiated back out into space, but is absorbed and re-radiated by greenhouse gases, which prevent it from escaping. This is what causes the warming effect that we associate with the greenhouse effect.

What Is the Phenomenon That Allows the Sun's Heat to Pass