SUNSET: 
Loosening the Hubble Tension
New James Webb Space Telescope observations may have done with one of the longest-standing tensions in cosmology.
Webb Telescope Measures Universe’s Expansion
Astronomers have used the Webb telescope to observe Cepheid variable stars, ruling out one source of the prevailing "Hubble tension.”
Replay of Star’s Death Sheds Light on Universe’s Expansion
A cosmic lens magnified the light of an exploding star. Now, astronomers are using observations of that supernova to calculate the universe’s current rate of expansion.
The Universe Is Too Smooth By Half
Results from a complex new analysis support cosmologists’ suspicions that something is missing from our understanding of the universe.
New 3D Map of the Universe — and a Growing Cosmological Debate
The Sloan Digital Sky Survey has released a new map of the universe — and the results confirm ongoing tension over the expansion rate of the universe.
Tension Over Hubble Constant Continues
A new measurement fuels an ongoing debate about the rate at which today’s universe is expanding.
Dark Energy Survey Releases First Three Years of Data
Results from the first data release of the Dark Energy Survey include eleven new stellar streams in the Milky Way galaxy.
Does Dark Energy Change Over Time?
Scientists are considering whether the mysterious “force” accelerating the universe’s expansion changes with time.
H0Li COW! Is Our Universe Expanding Faster Than We Thought?
Observations of lensed quasars suggest the universe is expanding more quickly than we thought. But they contradict what we know about the young universe.
Quasars Track Expanding Universe
The most precise measurement yet of the Hubble parameter illuminates dark energy — the elusive entity that’s accelerating the universe’s expansion.
