The cloud has baffled astronomers since its discovery in 2018. Now, a new study offers a possible cause for its appearance.

Made up of small fragments left behind by Halley’s Comet, these meteors are known for being especially bright and speedy.

JAXA is leading an international mission to reach Mars’ Phobos moon and bring soil back to Earth. If successful, it could unlock new clues about the history of the solar system.