Scientists have discovered 6 Y dwarf stars that are as cold as the human body. This was an exciting discovery, because astronomers had unsuccessfully been looking for the stars for over a decade. The reason for this is that these specific stars are nearly impossible to see with a visible-light telescope.
You can only see them with infrared vision telescopes, though. They are the coldest of the brown dwarf family and known as “failed” stars, because they're too low in mass to fuse atoms at their core and burn the fires that keep stars like our sun, shining .