Hubble constant

Spotted in New Gravitational Wave Discovery: A Stranger in the Stellar Graveyard

Palomar Transient Factory, Zwicky Transient Facility, small telescopes, Vera Rubin Observatory, Large Synoptic Survey Telescope, Shrinivas Kulkarni, SpaceX Starlink, astronomical twilight, Tata Institute of Fundamental Research, dark energy, Hubble constant, redshift, Doppler effect, charge-coupled devices, Type Ia supernovae, supernova, neutron stars, pulsars, millisecond pulsars, Alex Filippenko, Ooty radio telescope, Govind Swarup, IIT Delhi, Caltech Optical Observatory, Donald Backer,

Interview: Shrinivas Kulkarni, Finder of a Thousand Exploding Stars

Big Bang, Big Chill, Big Freeze, Big Rip, quantum tunneling, cosmic microwave background radiation, metric expansion of the universe, cosmic inflation, redshift, Doppler effect, metastable valley, Hubble constant, cosmological constant, Quintessence, dark energy, gravity, general theory of relativity,

Why Won’t the Gravity of Galaxies Keep Our Universe From Expanding?

Albert Einstein, general theory of relativity, gravitational lensing, Fritz Zwicky, Hubble constant, expansion of the universe, Sjur Refsdal, Orest Chwolson, Arthur Eddington, active galactic nuclei, black hole, Type Ia supernovae, Palomar Transient Factory,

How Astronomers Use Ginormous Natural Lenses to Study Distant Space Explosions

Hubble constant, Cepheid variables, Type Ia supernovae, Edwin Hubble, Georges Lemaître, Henrietta Swain Leavitt, Adam Riess, Hubble parameter, Wendy Freedman, Vesto Slipher,

Why Scientists Are Confused About How Fast the Universe Is Expanding

Gaia's sky in colour. Caption and credit: ESA/Gaia/DPAC

Fantastic Cosmic Beasts and Where to Find Them – Thanks to Gaia

Why Two Conflicting Measurements of the Universe’s Expansion Have Scientists Excited