#cosmology is an active hashtag on Bluesky. In the last 30 days, 80 people shared 160 posts with it — around 5 a day. Activity is up 41% versus the previous week, peaking on Aug 3 with 13 posts.

Posts with #cosmology

Nereide

@drnereide.bsky.social

over 1 year ago

1/4 🧪 🔭 #cosmology This graphic by Pablo Carlos Budassi provides a logarithmic map of the entire observable universe, thanks to data (updated as of May 2022) by researchers at Princeton University. Map source: www.visualcapitalist.com/…. (Tap on the image)

This image features a logarithmic map of the entire observable universe. It has a rectangular shape and highlights a number of different celestial objects (not shown to scale), including:
The Solar System
Comets and asteroids
Star systems and clusters
Nebulae
Galaxies, including the Milky Way
Galaxy clusters
Cosmic microwave background—radiation leftover from the Big Bang

70 331 2223

Nereide

@drnereide.bsky.social

over 1 year ago

🧵 This breathtaking image from #JWST, published last April 29, depicts a cosmic field filled with thousands of galaxies. THOUSANDS OF GALAXIES! Stars, marked by diffraction spikes, are within the Milky Way. Reference➡️ esawebb.org/images/potm2... 🔭 🧪 #stellarastro #cosmology #Universe #Webb

The image shows an area of deep space teeming with thousands of galaxies, like a bright mosaic on a deep black background. In the center, slightly lower, stands out a group of gold-white galaxies that shine brightly, like a cluster of gems. Around them, galaxies of various shapes dot the scene: some are spirals with curved arms, others are elliptical and smooth, still others have distorted shapes. The colors vary from white and blue for nearby galaxies to red for distant ones. Stars of the Milky Way appear as bright points with thin rays radiating outward, like small sparkling spikes. The overall effect is a dense and vibrant cosmic carpet, full of light and movement.

54 239 1953

Nereide

@drnereide.bsky.social

over 1 year ago

🧵 This panoramic image, combining X-rays from Chandra (orange, green, purple) & radio data (gray) from the MeerKAT telescope, provides an unprecedented view above and below the center of the Milky Way, revealing threads of superheated gas ➡️ chandra.si.edu/photo/2021/g... 🔭 🧪 #cosmology #galactic

The image reveal threads of superheated gas and magnetic fields near the center of the Milky Way. It combines X-rays from Chandra and radio data from the MeerKAT telescope. X-rays are orange, green, blue, and purple. Radio is lilac and gray.

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Lady Rocker

@geminienergy.bsky.social

over 1 year ago

🪐Saturn seen through a high-end telescope. 📸 Dan Borja (Astrophotographer) #astronomy #skyscience #saturn #photography #space #cosmology #moon

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Nereide

@drnereide.bsky.social

about 1 year ago

🧵 On 14 July 2025, the LIGO-Virgo-KAGRA (LVK) collaboration announced to have detected GW231123, a gravitational wave signal generated by the merger of the two most massive black holes ever observed. With masses of approximately 100 and 140 times that of the Sun, these cosmic giants 🔭 🧪 #cosmology

39 161 832

ESA Space Science

@science.esa.int

over 1 year ago

Our dark Universe detective 🕵️ Euclid has discovered a stunning Einstein ring! 💍 It surrounds galaxy NGC 6505, which is acting as a gravitational lens, bending light from a distant galaxy behind it. Why is this rare phenomenon so useful for scientists? 👉 www.esa.int/Science_Expl... 🔭🧪 #cosmology

$A sea of colourful stars and galaxies appear to swim in the vast blackness of space around a hazy halo at centre stage. In the middle of the image, the fuzzy-looking bulb of light in a warm shade of yellow extends around a small bright spot, nestled within a thin light circle that appears to be drawn closely around it. As we follow the central halo’s rim outwards, its brightness dims and blends smoothly into its surroundings. Here, extended discs of shades ranging from a warm purple to golden yellow, and piercing dots of light with sharp diffraction spikes are spread evenly across the image.$

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Nereide

@drnereide.bsky.social

over 1 year ago

🔭 🧪 #cosmology 🧵 1/ Crazy and fascinating! High-resolution images from Hubble, combined with data from the WM Keck Observatory, have allowed the identification of 9 rings in the giant galaxy LEDA 1313424, nicknamed "Bullseye". Image source➡️ esahubble.org/images/opo25... The rings were probably⤵️

This pic features the giant nine-ringed galaxy LEDA 1313424, nicknamed "Bullseye". The blue dwarf galaxy, sitting to its immediate center-left, seems to be the most likely impactor because it shows signs of disturbance, such as the formation of new stars in blue clumps, that could have been caused by the impact. The "small" impactor traveled like an arrow through the core of the Bullseye about 56 million years ago, leaving rings in its wake like ripples in a pond.

7 66 660

Nereide

@drnereide.bsky.social

1 day ago

1/6 In a 2020 study, that remains solidly current, astronomers report they have found AT LEAST SIX GALAXIES in the cosmic web around the luminous #quasar SDSS J1030+0524, powered by a one billion solar mass black hole. 🔭🧪⚛️ www.eso.org/public/news/... #cosmology #astronomy #galaxies

Artist’s rendering of a luminous quasar powered by a supermassive black hole at the centre of a gas network in the early Universe.
An intense white core shines in the middle, encircled by fine glowing blue filaments of gas that form an interconnected structure.
Six smaller bright points, representing the galaxies trapped in its gas web, are embedded within these filaments. The scene is set against a deep black space background.

1 18 68

Nereide

@drnereide.bsky.social

6 months ago

🧵 In case you missed it, here’s the #JWST wide-field view of the huge galaxy cluster MACS-J0417.5-1154, known for its stunning gravitational lensing effects and its wild ongoing merger dance. 🔭 🧪 ⚛️ ➡️ webbtelescope.org/content…. #cosmology #extragalactic #space #Astronomy #universe 1/8

The following caption comes from this web page: https://science.nasa.gov/asset/webb/macs-j04175-1154-wide-field-nircam-image/

"A cosmic question mark appears amid a powerful gravitational lens in the James Webb Space Telescope’s wide-field view of the galaxy cluster MACS-J0417.5-1154. Gravitational lensing occurs when something is so massive, like this galaxy cluster, that it warps the fabric of space-time itself, creating a natural funhouse-mirror effect that also magnifies galaxies behind it.
The rarely seen type of lensing captured here, which astronomers term hyperbolic umbilic, created five repeated images of one galaxy pair. The red, elongated member of this pair traces the familiar shape of a question mark across the sky due to the distortion, with another unrelated galaxy happening to be in just the right space-time to appear like the question mark’s dot – especially for humans who love to recognize familiar shapes and patterns."

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Nereide

@drnereide.bsky.social

about 1 year ago

🧵 The Cosmic Microwave Background (CMB) is like a snapshot of the newborn universe, taken 380,000 years after the Big Bang. It is a key piece of evidence for the standard cosmological model (ΛCDM), but a new study suggests that part of this signal... ➡️ uni-bonn.de/en/news/087-... 🔭 🧪 #cosmology

$This Hubble image depicts the massive elliptical galaxy ESO 325-G004. Located about 450 million light-years from Earth in the Abell 3574 supercluster, it is an example of early elliptical galaxies (ETGs), which, billions of years ago, were like "cosmic fires" thanks to intense bursts of star formation. Their light, absorbed and re-emitted by cosmic dust, may have mixed with the CMB, the "roar" of the Big Bang, influencing what we observe today During their formation, these galaxies shone 10,000 times brighter than they do today, contributing to the cosmic microwave background. Imagine a vast, luminous cloud suspended in a dark void, like a giant lantern illuminating the silence of space. The main galaxy has an oval shape, with a central core emitting a bright light, like the warm glow of a fire. This light gradually fades towards the edges, as if the galaxy were shrouded in a soft mist fading into darkness. The hue is warm, similar to a pale yellow or pale white, conveying a sense of calm, like a celestial object that witnessed the birth of the universe. There are no sharp details or irregularities, but a smooth, uniform surface, conveying an impression of order and stability. Surrounding the galaxy, the background is dark, like a moonless night sky, dotted with specks of light, resembling distant sparks. Other galaxies are visible, scattered like cosmic dust in a vast empty space.The stars marked by bright rays (diffraction spikes) belong to our galaxy, the Milky Way, and are foreground stars that appear in the field of view of the image taken by Hubble. The image evokes a sense of grandeur and mystery, as if we were mentally touching a remote corner of the early universe.$