If dark matter is a particle, it's possible that it could self-annihilate, becoming normal matter and releasing gamma radiation. Dwarf galaxies are the best objects to search for this radiation because they're small, rich in dark matter, and don't have other phenomena that could contaminate the view. A new survey examined 50 dwarf galaxies orbiting the Milky Way and saw a faint hint of gamma radiation that could be coming from dark matter annihilation.

Totality and the April 8th total solar eclipse offers a rare chance to study the Sun.