system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why is the Earth so warm, and the Space between us and the Sun so cold?
gpt
Try this:

Get a flashlight and point it at your toes.  

Why do your toes get brighter when a flashlight is shining on them but the space of air between the flashlight and your toes doesn’t get brighter?

Light and heat are both just energy at different wavelengths.  The heat from the sun is infrared (a longer wavelength than the color red)