system
Given the following post, respond as if you're commenting on Reddit:
human
During its creation, how exactly did the Earth cool down?

As far as I've known the heat energy from the creation of Earth has to go somewhere for Earth itself to cooldown. Where did all that heat go?
gpt
Radiation going into space.

Every object will emit electromagnetic radiation, with the spectrum and intensity depending on the temperature of the object. This is called thermal radiation. On the other hand, in the solar system objects also receive radiation from the sun. Ultimately, an equillibrium will be reached where the amount radiated out is equal (in terms of total energy) to the amount of solar radiation absorbed.

When the Earth was young and hot, it radiated far more than it absorbed from the sun, causing a net loss of heat. This caused the temperature to drop, lowering the amount of radiation emited, etc... until an equillibrium was reached.