system
Given the following post, respond as if you're commenting on Reddit:
human
What does not emit electromagnetic radiation?

My remote sensing textbook states "With the exception of objects at absolute zero, all objects emit electromagnetic radiation." 

I understand that an object doesn't have to emit it's own radiation, it can reflect another objects radiation.

So what are the processes that cause electromagnetic radiation to be emitted? 
Wha are objects that do not emit their own radiation?
gpt
Objects are made of atoms and atoms are made of charged particles (nuclei and electrons). Charged particles emit EM radiation when they are accelerated. All objects at a nonzero temperature T undergo some form of thermal motion and these random vibrations involve varying velocity and thus accelerations. Therefore all objects will emit a "baseline" spectrum due to thermal motion called a blackbody spectrum.

A blackbody (body that doesn't emit or reflect anything else other than the blackbody radiation) has a spectrum described by the Planck distribution, which is universal, depending only on the temperature and not on the details of the body or the material.

For temperatures above a few hundred degrees °C, the Planckian spectrum is significant in the visible range of wavelength and so bodies hotter than that glow with a specific colour and intensity, this is just incandescence.

At room temperature, most of the blackbody radiation is emitted in the far infrared region, therefore named thermal infrared, and this radiation is visible only through (relatively expensive) thermal cameras.