Cosmology
If Our Part of the Universe is Less Dense, Would That Explain the Hubble Tension?
In the 1920s, Edwin Hubble and Georges Lemaitre made a startling discovery that forever changed our perception of the Universe.…
The Early Universe Had No Problem Making Barred Spiral Galaxies
Spiral galaxies like the Milky Way are like cosmic snowflakes—no two are exactly alike. For many years, astronomers thought spirals…
There Aren’t Many Galaxies Like The Milky Way Nearby. Now We Know Why
The Milky Way is a barred spiral galaxy, maybe even a grand design spiral galaxy. We can't be sure from…
If You Account for the Laniakea Supercluster, The Hubble Tension Might Be Even Larger
When you measure the Universe's expansion rate to relatively nearby galaxies against the expansion rate in the cosmic microwave background…
The Largest Simulation of the Universe Ever Made
It's about time to retire the old astronomy joke: "Define the Universe and give three examples." That's because recent simulations…
Everything in the Universe Fits in This One Graph. Even the Impossible Stuff
The Universe has physical constants, such as the force of gravity that define everything. If these constants were any different,…
More JWST Observations are Finding Fewer Early Massive Galaxies
Astronomers using JWST were surprised to find mature-looking galaxies in the early Universe; they challenged existing models of cosmology. Astronomers…
Euclid Recovers From a Navigation Problem and Finds its Guide Stars Again
After a bit of a hiccup with its navigation system, Euclid has found its navigation stars and is pointed the…
Colliding Neutron Stars Could Help Measure the Expansion of the Universe
A new study presents a novel and independent method for measuring cosmic expansion using kilonova
The Big Bang: What is it? Why study it? What happened before? How will it all end?
Approximately 13.8 billion years ago, the greatest event in all of existence occurred that literally created existence itself. This event…