Astronomical observations

Satellite tracks observed for one hour over the northern Atacama Desert in Chile, October 2025. Credit: F. Kamphues, ESO/M. Kornmesser.

More than a million satellites could make the night sky three times brighter

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A new model has examined how light reflected from satellites and mirrors in space affects astronomical cameras and the brightness of the night sky. The results show that even dim satellites can erase parts of wide-field sky images,
Halley's Comet, supposedly in 1758.

The name “Hallie’s Comet” may belong to someone else: Study suggests 11th-century monk identified the periodicity before Edmond Halley

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According to an analysis by researchers at Leiden University in the Netherlands, evidence in medieval chronicles indicates that the monk Aylmer of Malmesbury linked observations in 989 and 1066 to the same periodic comet—hundreds of years before Halley established
A gravitational lens distorts objects behind it. Illustration: depositphotos.com

Mysterious object challenges accepted dark matter models

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Gravitational lensing analysis points to a body “the size of a million suns” with a structure unlike any known object – and may hint that dark matter is not as “smooth” as we thought
The composition of the universe. Illustration: depositphotos.com

Hidden change in dark energy could rewrite the laws of physics

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Dark energy may not be constant after all. DESI analysis of millions of galaxies shows signs that it may be evolving, suggesting a huge shift in cosmology
Asteroid 2024 Yr4 as observed from ESO's Very Large Telescope (VLT) in Chile, image released on 25 February 2025

Advanced observations almost eliminate the risk of asteroid 2024 YR4 collision in 2032

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The European Southern Observatory (ESO) tracked the asteroid with the Very Large Telescope in Chile and reached a more accurate prediction of the trajectory of the asteroid that threatened to destroy entire cities. * In recent weeks, calculations have been made according to which
The image shows diffuse gas (yellow to purple) contained within the cosmic filament connecting two galaxies (yellow stars), and extending over three million light-years. Credit: Davide Tornotti/University of Milano-Bicocca

Astronomers recently found a three-million-light-year connection between galaxies

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A new breakthrough in cosmic mapping has revealed the structure of a giant filament, part of a vast cosmic web that connects galaxies.
The early universe immediately after the big bang, with a chaotic background of energy and particles. Small, dense black holes, some the size of an atom, are scattered throughout the image. These black holes are described with a "color charge" aura, symbolizing the unique property of quarks and gluons. Around the black holes is a cosmic landscape of quark-gluon plasma, with hints of the beginnings of proton and neutron formation. The image was prepared using DALEE and is not a scientific image

Exotic black holes may be a byproduct of dark matter

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Fifty years ago, physicist Stephen Hawking proposed that dark matter might be a population of black holes, which may have formed shortly after the Big Bang. They also existed for a short time but had an impact on
A star cluster forms in a giant molecular cloud as reproduced by the simulation in the model. The picture is based on the model. The blue dots represent individual stars. Dark and light colors indicate the temperature of the gas (cold and hot). Visualization by Takaki Takeda (VASA ENTERTAINMENT INC.)

"Medium and powerful: medium-mass black holes can survive in globular clusters"

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First-ever model simulations of individual stars in a star cluster in the process of formation suggest possible mechanisms for the formation of intermediate-mass black holes
An artist's rendering of a collection of pulsars detecting gravitational waves from pairs of orbiting supermassive black holes. Credit: Aurore Simonnet for the NANOGrav Collaboration

Proof that the Earth is surrounded by a sea of ​​slow gravitational waves

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"The effect of gravitational waves on pulsars is very weak and difficult to detect, but we built the credibility of the findings over time as we collected more data," said Caterina Cazziano, NANOGrav team member and senior lecturer at Caltech.
A 1917 astronomical photographic plate spectrum of the star Van Meenen from the Carnegie Archives. The pull-out box shows the strong lines of the element calcium, which is surprising to see in a century-old spectrum. The spectrum is a thin (mostly) dark line in the center of the image. The broad dark spurs above and below the spectrum line originate from the bulbs used at the time to calibrate the image. In this image they appear in contrast to highlight the two emission lines missing from the star. Photo: Carnegie Institution for Science

A 1917 photographic plate reveals the first ever evidence of an extrasolar planetary system

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Clustering of Venus, Mercury and Jupiter, May 27, 2013. Photo: Amir Barnett, Ilan Ramon Center for Youth Seeking Physics. in Be'er Sheva

Jupiter and Venus are not alone: ​​Jupiter, Venus and Mercury are in conjunction these days

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A chart of the seasons as they appear in the Northern Hemisphere. Right: the winter solstice in December. From Wikipedia

Today is the autumnal equinox and why, although technically this is true, there is really no equinox between day and night

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This year the exact time of the autumnal equinox is September 22 at 14:49 GMT
Radar images of asteroid 1999 RQ36. Photo: NASA / GSFC / UA

NASA wants your help finding asteroids

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Ernst Friedrich Chaldani

Head-to-head with Newton: on Ernst Chaldani and the meteorites

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supernova From Wikipedia

Astronomy - The Big Bang Theory

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Jupiter, May 9, 2010, excluding the southern equatorial belt. Photo: Antony Wesley http://www.acquerra.com.au/astro/

Jupiter will reach its closest point to the Earth this week

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The orbits of the stars according to Tycho Brahe

Did Galileo Galilei ignore observations?

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Meeting between Venus and the Moon over the Alps in Austria in 2009. Photo: Tamas Ladani. From NASA's Photo of the Day website, January 2, 2009

Grouping of the moon and Venus, and in some places in the USA also of the space station and the shuttle

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Callisto. Photo: NASA

Callisto-Moon of Jupiter

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A four-legged robot learned to change its movement style to traverse a forest and jump over obstacles

Red mystery

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A four-legged robot learned to change its movement style to traverse a forest and jump over obstacles

The sun has no lithium because it has planets

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A four-legged robot learned to change its movement style to traverse a forest and jump over obstacles

On Tuesday, at five to nine, the space station will pass over Israel in record brightness

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A four-legged robot learned to change its movement style to traverse a forest and jump over obstacles

Project 365 - an unnamed ridge on the moon, a double star and Jupiter at its peak

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A four-legged robot learned to change its movement style to traverse a forest and jump over obstacles

Project 365 the rabbit on the moon

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