Astrophysics

Learn how Cepheid and RR Lyrae variables power the cosmic distance ladder via the period–luminosity relation, from Leavitt’s law to today’s H0 tension.

Understand gravitational waves, how LIGO and Virgo detect them, key discoveries, standard sirens, and what they reveal about black holes and neutron stars.

Discover how gravitational-wave observatories like LIGO, Virgo, and KAGRA detect cosmic ripples, what the signals reveal, and where the field is headed next.

Discover what dark matter is, the evidence for it, top particle candidates, and how experiments, lensing, and simulations are revealing the universe’s missing mass.

Dark matter explained: evidence from galaxies and the CMB, top candidates like WIMPs and axions, and the experiments hunting the universe’s invisible mass.

How pulsar timing arrays turn millisecond pulsars into cosmic clocks to detect the nanohertz gravitational-wave background and test general relativity.

How gravitational waves are detected, what produces them, and what they reveal about black holes, neutron stars, and the expanding Universe.

Learn how stars create the elements—from hydrogen fusion to supernovae and neutron star mergers. Explore s-, r-, and p-processes, evidence, and cosmic impacts.

Learn what neutron stars and pulsars are, how they form, emit signals, and test gravity, with insights from GW170817, NICER, magnetars, and pulsar timing.

How Cepheid variable stars reveal distances, calibrate Type Ia supernovae, and anchor the Hubble constant via the period–luminosity relation.

Discover what cosmic rays are, where they come from, how we detect them, and their impacts on technology, aviation, and climate—an in-depth astrophysics guide.

Discover how neutron star mergers produce kilonovae, gravitational waves, and heavy elements like gold. Physics, observations, and how to follow discoveries.