The haze shrouding Pluto might be made up of ice crystals possessing cyanide hearts, a new study finds.

Hazes, which are made of tiny motes of dust, smoke, ice and other substances, are not unique to Earth — scientists have detected hazes enveloping Mars, Venus, Saturn and Jupiter.

Nor are hazes limited to planets. Saturn's largest moon Titan, the only moon known to have clouds, is cloaked in a thick orange haze similar in makeup to smog on Earth. NASA's Voyager 2 spacecraft also detected haze in the atmosphere of Neptune's largest moon Triton.