Dwarf galaxies contain less than ten percent of the stars in the Milky Way. Find out how their behaviour in a region called the Fomax Cluster challenges dark matter's existence.
Galaxies without dark matter are rare and were once thought impossible. Find out how a new hypothesis about their formation may explain how all galaxies form and what dark matter is.
Scientists from the Chinese Academy of Sciences have identified 19 dwarf galaxies that appear to contain none of cosmology's mysterious dark matter. Learn why this challenges the conventional wisdom about the workings of our universe. (4:00 min read)