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#Astrodon

38 posts32 participants2 posts today
Public
Richard

"The four exoplanets orbit Barnard’s Star so closely that their years last only a few Earth days. They are probably rocky and, given their proximity to the star, uninhabitable. In fact, the 2024 study estimates Barnard b’s surface temperature to be a balmy 257 degrees Fahrenheit (125 degrees Celsius).

One of the exoplanets has the smallest mass ever detected using the wobble method, officially (and boringly) known as the radial velocity technique. This new record paves the way for more precise exoplanet hunting than ever before.

Exoplanet hunters are particularly interested in rocky planets within habitable zones, the ideal distance from a star to sustain liquid water. Why? Because water is a prerequisite for life—and maybe not just our own."

Astronomers Confirm 4 Rocky Exoplanets in Earth’s Backyard, Just 6 Light-Years Away
gizmodo.com/astronomers-confir

Gizmodo · Astronomers Confirm 4 Rocky Exoplanets in Earth’s Backyard, Just 6 Light-Years AwayA new study finally sheds light on our mysterious cosmic neighbors and sets a planet-hunting record.
#astronomy#Astrodon#exoplanet
Public *
franco_vazza

#paperday by Giada Piagnataro et al. ( including @annalisa_bonafede and me)

"Detection of magnetic fields in superclusters of galaxies"
arxiv.org/pdf/2503.08765

analysing with LOFAR (LOTSS) and VLA surveys (NVSS) the Faraday Rotation of ~4500 sources within and beyond a few famous superclusters of galaxies (Leo, Hercules, Corona Borealis).

Cool result: a field of ~20nG is detected on very large scales surrounding all these systems!

#astroph#astronomy#astrodon
Public
.

Decades ago, astrophysicist Stephen Hawking theorized that the Big Bang could have flooded the universe with tiny black holes, but the theory was never proven.

A group of researchers thinks they've found proof — with the discovery of a "stupendously powerful neutrino" at the bottom of the sea. The new hypothesis, not yet peer-reviewed, is that the neutrino is the signature of an evaporating black hole.

livescience.com/space/black-ho

Live Science · Evidence for Stephen Hawking's unproven black hole theory may have just been found — at the bottom of the seaBy Paul Sutter
#science#astrodon#BigBang
Public
ESO

A cup of gas, a pinch of dust, let rest for a few million years... Is there a universal recipe to form stars? 🧑‍🍳 ✨ A new survey of a thousand stellar factories suggests that this may not be the case.

Stars form when gas clouds fragment and collapse, but there are many physical processes that can change how this happens. So what we learn about one specific cloud doesn’t necessarily apply to others.

Using the Atacama Large Millimeter/submillimeter Array in #Chile, astronomers have mapped about a thousand stellar factories in different parts of our galaxy, to understand whether each one has its own secret recipe to make stars.

Learn more in our latest ESO blog: eso.org/public/blog/stellar-fa

www.eso.orgESOblog: Observing a thousand stellar factories to uncover the origin of starsObserving a thousand stellar factories to uncover the origin of stars
#astrodon#astronomy#astrophysics
Public
ESO

Planetary party portrait above Paranal!

In this image, taken in early February, the planets of the Solar System appear to parade one after the other above our Paranal Observatory in #Chile. Joining the party are the #Moon, the #MilkyWay, and a special guest: comet C/2024 G3 ☄️

A question we often get is whether the planets orbit the Sun in the same plane as the disc of the Milky Way. This image shows that's not the case: the plane of the Solar System –the ecliptic– is tilted about 60º relative to the Milky Way.

Read more: eso.org/public/images/potw2510

📷 B.Haeussler/ESO

The image is a circular fisheye projection, with the horizon around the circular edge and the highest part of the sky at the centre of the circle. It shows eight telescope domes around the edge. The moon lights the telescopes and the desert from behind, creating a haze across, but above it the sky is pretty dark and full of stars. Our Milky Way galaxy –– an arc made dense by white points and hues of pink and purple –– crosses the image vertically. Several planets, which look like dots, appear aligned more or less horizontally across the sky. The image is marked with text for white points of interest, including the Milky Way, planets and comet C/2024 G3, which looks like the streak of a shooting star, blazing white.
#astrodon#astronomy#astrophysics
Public
Richard

Clickbait article title

Potentially Habitable Super-earth Discovered Just 20 Light-years Away
dailygalaxy.com/2025/03/habita

"A Dynamic Climate Unlike Earth’s

Despite its location in the habitable zone, HD 20794 d is not a second Earth. Unlike our planet, which follows a nearly circular orbit, this super-Earth has an elliptical path, meaning its distance from its star varies significantly throughout its year.

This could lead to extreme temperature fluctuations, with periods where it moves closer to the inner edge of the habitable zone, experiencing more heat, before shifting outward to colder regions."

Potentially Habitable Super-Earth Discovered Just 20 Light Years Away
The Daily Galaxy - Great Discoveries Channel · Potentially Habitable Super-earth Discovered Just 20 Light-years AwayAstronomers have discovered a super-Earth just 20 light-years away, orbiting a Sun-like star in the habitable zone—where liquid water might exist. Could this be one of our best chances to study an Earth-like world up close?
#astronomy#Astrodon#exoplanet
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