Answer: Energy that flows back out into space comes from:

• The Earth, which generates heat (infrared energy) through radioactive decay within the Earth (geothermal energy)
• Solar radiation (sunlight) that hits the Earth’s atmosphere, and then is reflected directly back into space
• Solar radiation that has been absorbed by and stored in the Earth’s systems in the form of heat (infrared radiation). This heat gradually moves back into the atmosphere and into space.