Cosmology
A New Technique Confirms the Universe is 69% Dark Energy, 31% Matter (Mostly Dark)
How much "stuff" is there in the Universe? You'd think it would be easy to figure out. But, it's not.…
The Case for a Small Universe
Astronomers don't know if the Universe is finite or infinite. Whatever the case, it's larger than the Observable Universe, which…
Another New Way to Measure Distance in the Universe: Baryon Acoustic Oscillations
A team of astronomers have developed a new technique that relies on Baryon Acoustic Oscillations to measure cosmic distances.
It's Going to Take More Than Early Dark Energy to Resolve the Hubble Tension
Astronomers have measured the Universe's expansion rate and found that various methods don't agree, and their error bars don't overlap.…
A New Way to Measure the Expansion Rate of the Universe: Redshift Drift
Almost all the galaxies in the Universe are speeding away from us because of the Big Bang and the acceleration…
JWST is the Perfect Machine to Resolve the Hubble Tension
Over the last decade, various measurements have disagreed over the rate that the Universe is expanding. Astronomers use Cepheid variables…
Euclid Reaches L2, Shares its First Test Image
ESA's Euclid mission has made the journey through space to reach the Earth-Sun L2 Lagrange Point. The two instruments on…
An Enormous Cosmological Simulation Wraps Up, Recreating Even More of the Universe
There's an old joke among astronomy students about a question on the final exam for a cosmology class. It goes…
Carbon-Based Molecules Seen Just a Billion Years After the Big Bang
The more astronomers look at the early Universe, the more discoveries they make. Some of those finds change what they…
The Universe Could Be Twice As Old if Light is Tired and Physical Constants Change
A new paper argues that the universe is 26.7 billion years old. But the model only works by assuming tired…