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Longstanding mystery of matter and antimatter may be solved

Source: phys.org
Date: 19 May, 2020

An element which could hold the key to the long-standing mystery around why there is much more matter than antimatter in our Universe has been discovered by a University of the West of Scotland (UWS)-led team of physicists.

The UWS and University of Strathclyde academics have discovered, in research published in the journal Nature Physics, that one of the isotopes of the element thorium possesses the most pear-shaped nucleus yet to be discovered. Nuclei similar to thorium-228 may now be able to be used to perform new tests to try find the answer to the mystery surrounding matter and antimatter.

UWS's Dr. David O'Donnell, who led the project, said: "Our research shows that, with good ideas, world-leading nuclear physics experiments can be performed in university laboratories.

"This work augments the experiments which nuclear physicists at UWS are leading at large experimental facilities around the world. Being able to perform experiments like this one provides excellent training for our students."

https://www.phys.org/news/2020-05-longstanding-mystery-antimatter.amp
 

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Massive disk galaxy could change our understanding of how galaxies are born

Source: livescience.com
Date: 21 May, 2020

A massive, rotating disk galaxy that first formed just 1.5 billion years after the Big Bang, could upend our understanding of galaxy formation, scientists suggest in a new study.

In traditional galaxy formation models and according to modern cosmology, galaxies are built beginning with dark-matter halos. Over time, those halos pull in gases and material, eventually building up full-fledged galaxies. Disk galaxies, like our own Milky Way, form with prominent disks of stars and gas and are thought to be created in a method known as "hot mode" galaxy formation, where gas falls inward toward the galaxy's central region where it then cools and condenses.

This process is thought to be fairly gradual, taking a long time. But the newly discovered galaxy DLA0817g, nicknamed the "Wolfe Disk," which scientists believe formed in the early universe, suggests that disk galaxies could actually form quite quickly.

In a new study led by Marcel Neeleman of the Max Planck Institute for Astronomy in Germany, researchers spotted the Wolfe Disk using ALMA, the Atacama Large Millimeter/submillimeter Array in Chile. They found out that the object was a large, stable rotating disk, clocking in at a whopping 70 billion times the mass of our sun.

[...]

https://www.livescience.com/wolfe-disk-massive-galaxy-discovery.html


"...70 billion times the mass of our sun".

Contemplated cross-posting to, 'Things That Make You Go...WTF?'.
 

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SpaceX first attempt at launching astronauts to International Space Station is expected to happen at 20:33 UTC.
The instantaneous launch window opens at 4:33 p.m. EDT, or 20:33 UTC, with backup instantaneous launch opportunities available on Saturday, May 30 at 3:22 p.m. EDT, or 19:22 UTC, and on Sunday, May 31 at 3:00 p.m. EDT, or 19:00 UTC. Tune in here to watch the launch webcast. Coverage will begin about 4 hours before liftoff.
Live video:

More info from NASA here.
 
Last edited:

Vardoger

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New countdown for new launch of SpaceX rocket to ISS. The last one was cancelled because of weather.


After standing down from launch on Wednesday May 27, SpaceX is now targeting Saturday, May 30 for Falcon 9’s launch of Crew Dragon’s second demonstration (Demo-2) mission from Launch Complex 39A (LC-39A) at NASA’s Kennedy Space Center in Florida. This test flight with NASA astronauts Bob Behnken and Doug Hurley on board the Dragon spacecraft will return human spaceflight to the United States.

The instantaneous launch window opens at 3:22 p.m. EDT, or 19:22 UTC, with a backup instantaneous launch opportunity available on Sunday, May 31 at 3:00 p.m. EDT, or 19:00 UTC. Tune in here to watch the launch webcast. Coverage will begin about 4 hours before liftoff.

Demo-2 is the final major test for SpaceX’s human spaceflight system to be certified by NASA for operational crew missions to and from the International Space Station. SpaceX is returning human spaceflight to the United States with one of the safest, most advanced systems ever built, and NASA’s Commercial Crew Program is a turning point for America’s future in space exploration that lays the groundwork for future missions to the Moon, Mars, and beyond.
 

EnolaGaia

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The gravitational center (barycentre) of our solar system has now been pinpointed, and it's not located at the center of the sun. It's not even within the sun.
Astronomers Have Located The Centre of The Solar System to Within 100 Metres

When you picture the Solar System in your head, most people would think of the Sun, stolid and stationary in the centre, with everything else whizzing about around it. But every body in the Solar System also exerts its own gravitational tug on the star, causing it to move around just a tiny bit.

Therefore, the precise gravitational centre (or barycentre) of the Solar System is not smack-bang in the middle of the Sun, but somewhere closer to its surface, just outside it. But it hasn't been easy for us to figure out exactly where this barycentre is, due to the myriad gravitational influences at play. ...
FULL STORY: https://www.sciencealert.com/astron...ntre-of-the-solar-system-to-within-100-metres
 

eburacum

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Comet Neowise is becoming visible- and it's great. I had to get up at 02.30 to see it this morning, but it was impressive, We should be able to see it all night fairly soon. The problem is, it is in the north, which is the brightest part of the sky this time of year; apart from that, it's the best comet I've seen (and I've seen a few.)
.
_113284107_photo08-07-2020073046.jpg
 

eburacum

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(Well, Hale-Bopp was brighter, but it was a shapeless blob - Neowise is shaped like a proper comet at the moment).
 

BeardSprite

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Comet Neowise is becoming visible- and it's great. I had to get up at 02.30 to see it this morning...
I had a look for it last night (1:30am and again at 4am), as recounted here - no joy as yet, but if it remains visible long enough, should start being able to see it once it clears the trees around the park out back of here (central UK) around the 20th-ish.
 

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The asteroid ES04 2011 is approaching. Around September 1st it should pass about 40,000 miles from Earth, possibly within the Moon's orbit.
It is as big as a cathedral and we are all doomed. Doomed, I tell'ee.
 

ramonmercado

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The asteroid ES04 2011 is approaching. Around September 1st it should pass about 40,000 miles from Earth, possibly within the Moon's orbit.
It is as big as a cathedral and we are all doomed. Doomed, I tell'ee.
Cromer deserves o have a cathedral.
 

kamalktk

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Evidence for recent water activity on Ceres.

"Writing in an accompanying comment article, Julie Castillo-Rogez, from the California Institute of Technology's Jet Propulsion Laboratory, said the discovery of hydrohalite was a "smoking gun" for ongoing water activity.

"That material is unstable on Ceres' surface, and hence must have been emplaced very recently," she said."

https://phys.org/news/2020-08-dwarf-planet-ceres-ocean-world.html
 

EnolaGaia

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Here's a new astrophysical puzzle. A massive gas cloud pulses with a regular "heartbeat in the gamma-ray range, and this pulsation is synched with the "pulse" of a black hole 100 light years away. Why? How? Who knows? ...
Mysterious Gamma-Ray Heartbeat Coming From Cosmic Gas Cloud Leaves Scientists Baffled – “As Unexpected as Amazing”

Cosmic gas cloud blinks in sync with circling black hole.

Scientists have detected a mysterious gamma-ray heartbeat coming from a cosmic gas cloud. The inconspicuous cloud in the constellation Aquila is beating with the rhythm of a neighboring precessing black hole, indicating a connection between the two objects, as the team led by DESY Humboldt Fellow Jian Li and ICREA Professor Diego F. Torres from the Institute of Space Sciences (IEEC-CSIC) reports in the journal Nature Astronomy. Just how the black hole powers the cloud’s gamma-ray heartbeat over a distance of about 100 light years remains enigmatic. ...
FULL STORY: https://scitechdaily.com/mysterious...-scientists-baffled-as-unexpected-as-amazing/
 

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Interesting event.

Like the mythical half-human, half-horse creatures, centaurs in the solar system are hybrids between asteroids and comets.

Now, astronomers have caught one morphing from one type of space rock to the other, potentially giving scientists an unprecedented chance to watch a comet form in real time in the decades to come.

“We have an opportunity here to see the birth of a comet as it starts to become active,” says planetary scientist Kat Volk of the University of Arizona in Tucson.

The object, called P/2019 LD2, was discovered by the ATLAS telescope in Hawaii in May. Its orbit suggests that it’s a centaur, a class of rocky and icy objects with unstable orbits. Because of that mixed composition and potential to move around the solar system, astronomers have long suspected that centaurs are a missing link between small icy bodies in the Kuiper Belt beyond Neptune and comets that regularly visit the inner solar system (SN: 11/19/94).

These “short-period” comets, which are thought to originate from icy objects in the Kuiper Belt, orbit the sun once a decade or so, and make repeat appearances in Earth’s skies. (Long-period comets, like Halley’s Comet, which visits the inner solar system once a century, probably originate even farther from the sun, in the Oort cloud (SN: 10/25/13).) ...

https://www.sciencenews.org/article/space-rock-comet-centaur-astronomy
 

EnolaGaia

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The Oort cloud doesn't conform to solar system formation models in terms of its size or density. New simulation-based research suggests these anomalies are better explained if our sun had originated as one of a binary pair of stars.
The sun may have a long-lost twin

The most distant region of our solar system, a sphere of dark, icy debris out beyond Neptune, is too crowded. All that stuff out there, beyond the reach of the ancient disk of gas and dust that formed the planets, doesn’t match with scientific models of how the solar system formed. Now, a pair of researchers has offered a new take on this far-out mystery: Our sun has a long-lost twin. And the two stars spent their childhoods collecting the passing debris from interstellar space, crowding the outer reaches of the solar system.

We can't see this twin. Wherever it is — if it ever existed — it broke away from its orbit with our sun eons ago. The two stars would have circled the Milky Way well over a dozen times since then, and may have ended up in totally different regions of space. But a record of that lost twin's influence on our solar system may remain in our Oort cloud — a mysterious neighborhood of comets and space rocks at the outer bounds of our sun's influence.

The Oort cloud is a strange place. Unlike the planets and asteroids of the inner solar system, which lie on a single flat disk around the sun, it forms a hollow sphere of debris encircling the solar system in every direction. Compared to the inner planets, these distant drifters experience very little of the sun's gravity, and could easily be nudged out of their orbits and into interstellar space. The most distant objects in that sphere are barely linked to our sun at all, drifting along 100,000 times farther away from the sun than Earth. ...

All that mass far beyond Neptune causes problems for astronomers, Loeb said. So does the fact that the Oort cloud forms a sphere, when all the planets and asteroids in the inner solar system seem to have formed from one flat disk of dust and gas.

"The question is: How did it come to exist?" Loeb told Live Science. "The popular view is that maybe they were scattered from the disk that made the planets." ...

And simulations of Oort cloud formation that have all the objects coming from the inner solar system suggest it should have somewhere between one-third and one-tenth the number of large objects it seems to hold.

"You cannot easily explain the large number of Oort cloud objects this way," Loeb said.

And if you assume there's a big planet orbiting out there, the crowded Oort cloud gets even more difficult to explain. ...

In this case, together with his frequent collaborator, Harvard undergraduate Amir Siraj, Loeb suggested that the sun may have worked together with a lost twin to capture passing objects from deep space. ...
FULL STORY: https://www.livescience.com/planet-9-sun-twin.html
 

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Apparently theres going to be some big astronomy news announced on monday 14th Sept.

That night's edition of 'The Sky at Night' is going to cover it.

It can't be anything 'earth-shattering' - aliens- asteroid heading our way - as any really big news would surely of leaked.

So what can it be? Water detected in the atmosphere of an exoplanet is my guess.
 

blessmycottonsocks

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Apparently theres going to be some big astronomy news announced on monday 14th Sept.

That night's edition of 'The Sky at Night' is going to cover it.

It can't be anything 'earth-shattering' - aliens- asteroid heading our way - as any really big news would surely of leaked.

So what can it be? Water detected in the atmosphere of an exoplanet is my guess.
No. It's a biosignature possibly indicative of life on Venus.

https://www.theguardian.com/science...ind-gas-linked-to-life-in-atmosphere-of-venus
 

EnolaGaia

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X-shaped object:
 
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