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#comets

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Daniel Fischer

Dust shells and dark linear structures on dust tails of historical and recent long-period #comets: aanda.org/articles/aa/full_htm -> "in all the cases analyzed, the dust shells form as a result of short-term events characterized by cyclically varying ejection of very small particles from large surface areas on the rotating nucleus. [...] The dark linear stripes along the tail axes may arise from a specific dependence of the ejection speeds on the square root of the cosine of the zenith angle".

www.aanda.orgDust shells and dark linear structures on dust tails of historical and recent long-period comets | Astronomy & Astrophysics (A&A)Astronomy & Astrophysics (A&A) is an international journal which publishes papers on all aspects of astronomy and astrophysics
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:rss: Hacker News

Oxygen discovered in most distant known galaxy
eso.org/public/news/eso2507/
#ycombinator #ESO #eso_org #Astronomy #Astrophysics #Astronomie #Suedsternwarte #telescopes #detectors #comets #planets #stars #galaxies #nebulae #universe #NTT #VLT #VLTI #ALMA #ELT #La_Silla #Paranal #Garching #Chile

www.eso.orgOxygen discovered in most distant known galaxyTwo different teams of astronomers have detected oxygen in the most distant known galaxy, JADES-GS-z14-0. The discovery, reported in two separate studies, was made possible thanks to the Atacama Large Millimeter/submillimeter Array (ALMA), in which the European Southern Observatory (ESO) is a partner. This record-breaking detection is making astronomers rethink how quickly galaxies formed in the early Universe.
Continued thread
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Ele Willoughby, PhD

were previously unknown! She also found 8 or 9 #comets, as well as making & sharing observations of comets discovered by others. The portrait is based on a miniature of Caroline, as well as her notes & diagrams from 1 August 1786, when she discovered her first comet, now known as Comet C/1786 P1 (Herschel).⁠
⁠
In order to calculate orbits of newly discovered comets, it was important to let other astronomers know ASAP. She discovered her 8th comet while her brother was away.🧵4/5

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Miro Collas

Rare comet may be visible for only time in 160,000 years
bbc.com/news/articles/cvge4e7d

"While the exact locations for possible visibility are unknown, experts believe the comet, which could shine as bright as Venus, may be best observed from the southern hemisphere."

www.bbc.comRare comet may be visible for only time in 160,000 yearsComet C/2024 G3 could shine as bright as Venus due to its close proximity to the Sun.
#Astronomy#Cosmology#Comets
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:rss: Hacker News

Darkest and clearest skies at risk from industrial megaproject
eso.org/public/news/eso2501/
#ycombinator #ESO #eso_org #Astronomy #Astrophysics #Astronomie #Suedsternwarte #telescopes #detectors #comets #planets #stars #galaxies #nebulae #universe #NTT #VLT #VLTI #ALMA #ELT #La_Silla #Paranal #Garching #Chile

www.eso.orgWorld's darkest and clearest skies at risk from industrial megaprojectOn December 24th, AES Andes, a subsidiary of the US power company AES Corporation, submitted a project for a massive industrial complex for environmental impact assessment. This complex threatens the pristine skies above ESO’s Paranal Observatory in Chile’s Atacama Desert, the darkest and clearest of any astronomical observatory in the world [1]. The industrial megaproject is planned to be located just 5 to 11 kilometres from telescopes at Paranal, which would cause irreparable damage to astronomical observations, in particular due to light pollution emitted throughout the project’s operational life. Relocating the complex would save one of Earth's last truly pristine dark skies.
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The Conversation U.S.

Scientists have identified two types of "dark comets" in our solar system - objects that accelerate like comets but lack visible tails. A planetary scientist explains how these elusive bodies could reveal clues about the origins of Earth's oceans:
buff.ly/4gtrxVM
#astronomy #comets #asteroids

The Conversation2 populations of dark comets in the solar system could tell researchers where the Earth got its oceansComets without tails, called dark comets, are a newly discovered space object. Now, astronomers know they come in 2 classes.
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formuchdeliberation

ScienceAlert: ‘Dark Comets’ Come in Different Varieties, And It Could Have Implications For Life on Earth…

So often when we think we understand something, another thing comes along that forces us to pause, reconsider, and broaden our minds to encompass these new and fascinating pieces of information... intro from Science Alert #comets #solarsystem #science #space

formuchdeliberation.wordpress.

for much deliberation · ScienceAlert: ‘Dark Comets’ Come in Different Varieties, And It Could Have Implications For Life on Earth…So often when we think we understand something, another thing comes along that forces us to pause, reconsider, and broaden our minds to encompass these new and fascinating pieces of information&#82…
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