A simple explanation of dark matter and antimatter, how they differ, how scientists study them, and why both are important to understanding the universe.

Our universe is filled with particles, such as electrons and protons, which make up all the stuff on our planet and beyond: animals, plants, people, planets, asteroids, stars, gas clouds, and galaxies ...

The universe's matter-antimatter asymmetry, where matter significantly outweighs antimatter despite their theoretically equal creation at the Big Bang, remains a major unsolved problem in physics.

(The Conversation is an independent and nonprofit source of news, analysis and commentary from academic experts.) Imagine an epic video game with your favorite hero as a character. Another character ...