Astronomical News

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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?'.
 

Vardoger

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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.
 
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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.
 

escargot

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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.
 
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