Astronomy

A mathematical model suggests that when a pair of black holes gets quantum entangled, this can give rise to a lumpy space-time tunnel between them

Neuroscientist Matthew Sacchet is revealing how mastering meditation can not only enable transcendental states of bliss, but also reshape how we experience pain and emotion

Neuroscientist Matthew Sacchet is revealing how mastering meditation can not only enable transcendental states of bliss, but also reshape how we experience pain and emotion

Researchers warn that the alga Karenia cristata, which has killed around a million animals in Australian waters in one of the biggest algal blooms ever seen, could harm marine life elsewhere

Researchers warn that the alga Karenia cristata, which has killed around a million animals in Australian waters in one of the biggest algal blooms ever seen, could harm marine life elsewhere

Limited COVID surveillance data are hampering vaccination and health strategies, researchers say

A cosmic explosion known as GRB 250702B is by far the longest gamma-ray burst astronomers have ever seen—if it’s even one at all

Observing obstacles plague all amateur astronomers, but when the chance arises, we can still embrace unanticipated wonder.

The post Stargazing Opportunities Lost and Found appeared first on Sky & Telescope.

Biochemical evidence suggests Norse people settled in Iceland almost 70 years before the accepted arrival date of the 870s, and didn't chop down the island's forests

Biochemical evidence suggests Norse people settled in Iceland almost 70 years before the accepted arrival date of the 870s, and didn't chop down the island's forests

Avoidant/restrictive food intake disorder, or ARFID, can cause malnutrition and weight loss in children and adults even when body image is not a factor

Why saying no is harder than it should be.

Image:

This shimmering view of interstellar gas and dust was captured by the European Space Agency’s Euclid space telescope. The nebula is part of a so-called dark cloud, named LDN 1641. It sits at about 1300 light-years from Earth, within a sprawling complex of dusty gas clouds where stars are being formed, in the constellation of Orion.

In visible light this region of the sky appears mostly dark, with few stars dotting what seems to be a primarily empty background. But, by imaging the cloud with the infrared eyes of its NISP instrument, Euclid reveals a multitude of stars shining through a tapestry of dust and gas.

This is because dust grains block visible light from stars behind them very efficiently but are much less effective at dimming near-infrared light.

The nebula is teeming with very young stars. Some of the objects embedded in the dusty surroundings spew out material – a sign of stars being formed. The outflows appear as magenta-coloured spots and coils when zooming into the image.

In the upper left, obstruction by dust diminishes and the view opens toward the more distant Universe with many galaxies lurking beyond the stars of our own galaxy.

Euclid observed this region of the sky in September 2023 to fine-tune its pointing ability. For the guiding tests, the operations team required a field of view where only a few stars would be detectable in visible light; this portion of LDN 1641 proved to be the most suitable area of the sky accessible to Euclid at the time.

The tests were successful and helped ensure that Euclid could point reliably and very precisely in the desired direction. This ability is key to delivering extremely sharp astronomical images of large patches of sky, at a fast pace. The data for this image, which is about 0.64 square degrees in size – or more than three times the area of the full Moon on the sky – were collected in just under five hours of observations.

Euclid is surveying the sky to create the most extensive 3D map of the extragalactic Universe ever made. Its main objective is to enable scientists to pin down the mysterious nature of dark matter and dark energy.

Yet the mission will also deliver a trove of observations of interesting regions in our galaxy, like this one, as well as countless detailed images of other galaxies, offering new avenues of investigation in many different fields of astronomy.

[Technical details: The colour image was created from NISP observations in the Y-, J- and H-bands, rendered blue, green and red, respectively. The size of the image is 11 232 x 12 576 pixels. The jagged boundary is due to the gaps in the array of NISP’s sixteen detectors, and the way the observations were taken with small spatial offsets and rotations to create the whole image. This is a common effect in astronomical wide-field images.]

[Image description: The focus of the image is a portion of LDN 1641, an interstellar nebula in the constellation of Orion. In this view, a deep-black background is sprinkled with a multitude of dots (stars) of different sizes and shades of bright white. Across the sea of stars, a web of fuzzy tendrils and ribbons in varying shades of orange and brown rises from the bottom of the image towards the top-right like thin coils of smoke.]

Initiatives on the table at COP30 aim to evaluate which countries are most vulnerable, support efforts to clean up industries and pay for the protection of tropical forests

Initiatives on the table at COP30 aim to evaluate which countries are most vulnerable, support efforts to clean up industries and pay for the protection of tropical forests

A new study proposes how we could look for signs of self-replicating (Von Neumann) probes that would prove that the Solar System has been explored by an advanced extraterrestrial intelligence (ETI).

Getting covid-19 for the first time slightly increased the risk of heart inflammation, blood clots and bleeding disorders among children, whereas being vaccinated against the virus was much safer and sometimes protective

Getting covid-19 for the first time slightly increased the risk of heart inflammation, blood clots and bleeding disorders among children, whereas being vaccinated against the virus was much safer and sometimes protective

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The Copernicus Sentinel-1D satellite has joined the Sentinel-1 mission in orbit. Launch took place on 4 November 2025 at 22:02 CET (18:02 local time) on board an Ariane 6 launcher from Europe’s Spaceport in French Guiana.

The Sentinel-1 mission delivers high-resolution radar images of Earth’s surface, performing in all weathers, day-and-night. This service is used by disaster response teams, environmental agencies, maritime authorities and climate scientists, who depend on frequent updates of critical data.

Sentinel-1D will work in tandem with Sentinel-1C, flying in the same orbit but 180° apart, to optimise global coverage and data delivery. Both satellites have a C-band synthetic aperture radar (SAR) instrument on board, which captures high-resolution imagery of Earth’s surface. They are also equipped with Automatic Identification System (AIS) instruments to improve detection and tracking of ships. When Sentinel-1D is fully operational, it will enable more frequent AIS observations, including data on vessel identity, location and direction of passage, enabling precise tracking.

Sentinel-1D was launched on Europe’s heavy-lift rocket Ariane 6 on flight designated VA265. 

Read full story: Copernicus Sentinel-1D reaches orbit on Ariane 6

Access the related broadcast quality video material: Sentinel-1D launch on Ariane 6 - VA265 / Sentinel-1 mission animations