Parsec

New images from the Atacama Cosmology Telescope (ACT) reveal the Universe when it was about 380,000 years old.

New observations from Webb confirms previous Hubble measurements of distances between nearby stars and galaxies, offering a crucial cross-check to address the mismatch in measurements of the Universe's mysterious expansion. Known as the Hubble tension, the discrepancy remains unexplained even by the best cosmology models.

What are we missing?

The celestial body is the youngest transiting planet found to date.

It is almost 100 years since scientists discovered the universe is expanding. In the decades that followed, the accuracy of the measurements, and interpretations and implications of this discovery, were a source of fierce debate. We now know the universe emerged dramatically from a highly compressed state in an event known as the Big Bang.

The jets are 140 times larger than the Milky Way.

Right now, it looks like cosmology is at a tipping point. Will the James Webb telescope resolve the issue by revealing new physics?

By using protons to probe how a magnetic field responds to an expanding plasma, experimenters have replicated the particle jets spewed out by active black holes.

"A new front has opened in the longstanding debate over how fast the universe is expanding," writes Science magazine: For years astronomers have argued over a gulf between the expansion rate as measured from galaxies in the local universe and as calculated from studies of the cosmic microwave backg...

The Jupiter-like world Epsilon Indi Ab is one of the coldest—and closest—exoplanets that astronomers have ever seen

New calculations reveal that pairs of supermassive black holes can merge into a larger black hole because of previously overlooked behavior of dark matter particles, proposing a solution to the long-standing 'final parsec problem.'

Using NASA's Transiting Exoplanet Survey Satellite (TESS) and many other telescopes, two teams of astronomers have discovered a temperate, Earth-sized exoplanet orbiting a cool red dwarf called Gliese 12.

Gliese 12b orbits a red dwarf 40 light years again and is reportedly the most promising candidate yet among worlds deduced to be potentially-habitable and Earthlike. "We've found the nearest,…

NGC 6440 is a typical massive, obscured and contaminated globular cluster formed and orbiting within the bulge of our Milky Way Galaxy.

These astronomical outlaws are journeying through the abyss with secrets from a distant realm.

The gigantic galaxies we see in the universe today, including our own Milky Way galaxy, started out far smaller. Mergers throughout the universe's 13.7 billion years gradually assembled today's massive galaxies. But they may have begun as mere star clusters.

MIT physicists discovered stars near the edge of the Milky Way travel more slowly than those closer to its center — a surprise suggesting our galaxy's gravitational core may have less dark matter than previously thought.

Using the Karl G. Jansky Very Large Array (VLA), astronomers have discovered a millisecond pulsar in the globular cluster GLIMPSE-C01 as part of the VLA Low-band Ionosphere and Transient Experiment (VLITE). This is the first pulsar ever detected in this cluster. The finding was reported in a paper published December 18 on the pre-print server arXiv.

Scientists think we could live in a giant void, a less-dense bubble leftover from the Big Bang. If so, it could explain the expansion rate of the universe. The post Could a giant void explain the universe's expansion? first appeared on EarthSky.

Study by the Universities of Bonn and St. Andrews proposes a new possible explanation for the Hubble tension. The universe is expanding. How fast it does so is described by the so-called Hubble-Lemaitre constant. But there is a dispute about how big this constant actually is: Different measuremen