It’s been over 20 years since astronomers first discovered that the expansion of the Universe is accelerating thanks to dark energy. And in these decades, astronomers still don’t have much evidence for what could be causing the increased expansion rate. Maybe there’s something else going on to explain it.
Astronomers have made extremely accurate measurements of the expansion rate of the Universe and come up with different results. And the error bars for the observations don’t overlap, so there’s something strange going on. What’s the answer and how can the Crisis in Cosmology be resolved?
The winter AAS meeting was heavy on news from the James Webb Space Telescope. What were some of the new results that were announced?
The @AstronomyCast reach 666 episodes. To celebrate, here’s an episode about things in the Universe that have been named after mythological people and places in the underworld!
The Cosmic Microwave Background Radiation tells us so much about the Universe. After that era, the Universe went dark. Then, as gas pulled together into the first stars and eventually galaxies, light returned, beginning the Age of Reionization.
The Sun is a third-generation star, polluted with metals from long-dead suns. Astronomers have also discovered second-generation stars, with very low metallicity. But theories suggest there must be a first generation, with stars made from only pure hydrogen and helium. Can we ever find them?
A huge part of the Solar System is just made of ice. There are comets, rings, moons and even dwarf planets. Where did all this ice come from, and what impact has it had for life on Earth?
With Christmas just around the corner, we thought we’d investigate a mystery that has puzzled historians for hundreds of years
Using pockets of gas found in tiny crystals, scientists have created a timeline for the formation and eruption of four supervolcano events in northern Chile more than twenty million years ago.
We generally save our stargazing suggestions for the summer, when it’s warmer in the northern hemisphere. But let see some wonderful things you can see in the night sky this time of year.