Artist concept of the Milky Way. Credit: NASA/JPL-Caltech. Astrophysicists say they have found an answer to why spiral galaxies like our own Milky Way are largely missing from a part…
Category: Cosmology
The universe is expanding faster than theory predicts—physicists are trying to explain the mismatch
The James Webb Space Telescope’s deep field image shows a universe full of sparkling galaxies. Credit: NASA/STScI Astronomers have known for decades that the universe is expanding. When they use…
Black holes could come in ‘perfect pairs’ in an ever expanding universe
Two black holes can be held at a fixed distance when their gravitational attraction (red arrows) is offset by the cosmic expansion (blue arrows) associated with a cosmological constant. Such…
It’s going to take more than early dark energy to resolve the Hubble tension
Hubble tension has gotten worse lately. Credit: Perivolaropoulos and Skara Our best understanding of the universe is rooted in a cosmological model known as LCDM. The CDM stands for cold…
Dynamical dark energy might explain strange 21-cm signal
An artist’s representation of what the first stars to light up the universe might have looked like in the Cosmic Dawn. Credit: NASA/WMAP Science Team Dark energy may evolve in…
Cosmological models are built on a simple, century-old idea, but new observations demand a radical rethink
by David Wiltshire, Eoin O Colgain, Jenny Wagner and Shahin Sheikh-Jabbari, The Conversation Our ideas about the universe are based on a century-old simplification known as the cosmological principle. It…
Primordial black holes may have ‘frozen’ the early universe
Artist’s logarithmic scale conception of the observable universe with the Solar System at the center, inner and outer planets, Kuiper belt, Oort cloud, Alpha Centauri, Perseus Arm, Milky Way galaxy,…
The first black hole portrait got sharper thanks to machine learning
If the first image of a black hole looked like a fuzzy doughnut, this one is a thin onion ring. Using a machine learning technique, scientists have sharpened the portrait…
Scientists find first evidence that black holes are the source of dark energy
NGC524: NGC 524 is a lenticular galaxy in the constellation Pisces. It is at a distance of about 90 million light-years away from Earth. Credit: ESA/Hubble Observations of supermassive black…
