Learn what neutron star mergers are, why they matter, and how they create gravitational waves, heavy elements, and gamma-ray bursts.

Learn what dark matter is, why scientists believe it exists, and how it shapes galaxies, gravity, and the large-scale structure of the universe.

Explore the key galaxy-scale clues that reveal dark matter, from rotation curves and lensing to mass-to-light ratios and satellite motions.

Learn the key differences between neutron stars and black holes, from mass and gravity to formation, structure, and observable behavior.

Learn how hot neutron stars get, why their temperatures vary, and what astronomers infer from their extreme heat.

Learn why dark matter is called dark, how it differs from ordinary matter, and what astronomers infer from its invisible gravitational effects.

Magnetars are neutron stars with magnetic fields so extreme they can reshape matter, light, and space around them.

Explore why dark energy matters for the future of the universe, from cosmic expansion and galaxy evolution to the leading theories shaping what comes next.