About Dark Matter Day

What is Dark Matter Day?

On and around October 31, 2017, the world celebrated the hunt for the unseen—something that scientists refer to as dark matter. Local events organized by institutions and individuals around the planet explored its mysteries, and highlighted the experiments that could bring us closer to solving them. Since then, Dark Matter Day has become an annual celebration with labs around the world taking part. Stay tuned for information about Dark Matter Day 2024.

Dark Matter Day Background

Less than 5 percent of the total mass and energy in the universe is the stuff we know about: like stars, planets, galaxies, and gases.