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Ancient disk galaxy challenges our understanding of early galaxy formation – News Landed

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According to a recently published study in the journal Nature, astronomers using the Atacama Large Millimeter/submillimeter Array (ALMA) in Chile have discovered a massive disk galaxy that formed 12.3 billion years ago, merely 1.5 billion years after the Big Bang.

This stable disk galaxy is designated DLA0817g (Wolfe Disk) and has approximately 72 billion solar masses. For reference, our Milky Way galaxy has about 1.2 trillion solar masses. Wolfe Disk spins at about 272 km per second, which is similar to our galaxy’s rotational velocity. The rate of star formation in the Wolfe Disk, however, is about 10 times higher than in our galaxy.

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While it is currently only a sample size of one, Wolfe Disk presents a challenge to our current model of “hot mode” galaxy formation wherein hot gases fall in toward the galactic center to cool and condense gradually over time. In this scenario, it would take about 4-6 billion years before galaxies could form well-defined disks. Hierarchical mergers could also eventually form disk galaxies, but this process is also very gradual and similarly time-consuming.

Instead, the prevailing theory of early disk galaxy formation is “cold-mode accretion.” As the name suggests, the gas falling into the galactic center would have been cold, hence leading to rapid condensation. So far, this seems to best explain the formation of such a massive disk galaxy at such an early age in the Universe. If the theory is correct, we should eventually find more early galaxies like Wolfe’s Disk.

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‘Strawberry Moon’ to rise with a special eclipse for some skywatchers – Globalnews.ca

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The full moon on Friday, June 5 might look a little different in some parts of the world, where the so-called “Strawberry Moon” will fall partially under the Earth’s shadow.

The phenomenon, known as a penumbral lunar eclipse, occurs when the Earth comes between the sun and the moon, thereby casting a faint shadow on the moon. This penumbral lunar eclipse will make the full moon look slightly darker on part of its surface, although only some portions of the world will see it.

The penumbral lunar eclipse will only be visible from parts of Australia, Asia, Africa, Europe and South America, according to NASA’s charts.


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In other words, North Americans will need to watch a livestream on the internet to catch a glimpse of the event, which starts at 3 p.m. EDT. Nevertheless, the so-called “Strawberry Moon” will be visible to everyone.

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That name comes from the time of year and not the expected colour of the moon. There are farm-related nicknames for the first full moon of every month, and the strawberry nickname originated from the Algonquin First Nation, according to the Old Farmer’s Almanac. The first full moon of June often coincided with the harvest season for wild strawberries in North America, the Almanac says.


The Strawberry Moon is practically full over the horizon as a lady poses for a photo in Malaga, Spain, on June 4, 2020.


Jesus Merida/SOPA Images/LightRocket via Getty Images

Although skywatchers in Canada and the U.S. will miss out on this penumbral lunar eclipse, they’ll only have to wait a month to catch the next one. Another penumbral lunar eclipse is slated to happen on July 5, and that one should be visible from North America. The darkest penumbral lunar eclipse of the year is expected on Nov. 30.

A penumbral lunar eclipse also happened on Jan. 10, coinciding with that month’s “Wolf Moon.”

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Timelapse captures moment sky darkens for total solar eclipse


Timelapse captures moment sky darkens for total solar eclipse

Not to throw shade at the penumbral lunar eclipses, but they’ll likely pale in comparison to the annular solar eclipse predicted for June 21. That’s when the moon will pass between the Earth and the sun, making the sun look like a ring of fire for viewers in parts of Africa, China, northern India and Pakistan, according to TimeandDate.com.

Again, it won’t be visible from North America — but you’ll still be able to watch the whole thing online without risking eye damage from staring at the sun.

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© 2020 Global News, a division of Corus Entertainment Inc.

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In Space No One Can Hear You Campaign: Trump Team Pulls Ad – NDTV

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Donald Trump’s re-election campaign has pulled a video featuring the SpaceX launch and astronauts

Washington:

President Donald Trump’s re-election campaign has pulled a video featuring the SpaceX launch and astronauts which appeared to violate NASA’s media regulations, reports said.

The “Make Space Great Again” YouTube ad posted on YouTube showed footage from the Apollo program, as well as video of the landmark SpaceX Demo-2 mission and NASA astronauts Bob Behnken and Doug Hurley, the SpaceNews.com website said.

YouTube shows the video was removed by the uploader.

NASA generally allows use of its images and video but prohibits the use of its insignia and photographs of its astronauts in advertisements.

“As a government agency, NASA will not promote or endorse or appear to promote or endorse a commercial product, service or activity. Therefore, there are strict limits placed on the use of any of the NASA identities and emblem imagery in advertisements,” the space agency’s advertising regulations say.

“Astronauts or employees who are currently employed by NASA cannot have their names, likenesses or other personality traits displayed in any advertisements or marketing material.”

Hurley’s wife Karen Nyberg, a retired astronaut, and their young son were also reportedly shown in the clip.

“I find it disturbing that a video image of me and my son is being used in political propaganda without my knowledge or consent. That is wrong,” Nyberg tweeted.

A Change.org petition to “Stop Donald Trump politicizing SpaceX and NASA accomplishments” has attracted more than 6,000 signatures so far.

The New York Times described the video as “the latest effort by the president to parlay his stewardship of American space policy into an upbeat campaign issue.”

The SpaceX mission, which blasted off from Florida’s Kennedy Space Center on May 30, was the first crewed US spacecraft in nearly a decade.

Trump, who witnessed the liftoff, has relaunched the race to re-conquer the Moon and to journey onwards to the Red Planet.

But the deadlines — 2024 and 2033 respectively — appear unrealistic and have caused turbulence within the space agency.

(This story has not been edited by NDTV staff and is auto-generated from a syndicated feed.)

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Donald Trumps campaign team pulls ad featuring NASA astronauts after backlash – Republic World – Republic World

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US President Donald Trump’s re-election campaign pulled a video featuring the historic Dragon Crew launch after backlash from astronauts and NASA officials. Trump has been trying to project the success of NASA and SpaceX as an achievement of his administration and the latest video appeared to be in violation of the space agency’s policy.

Advertisement video posted on YouTube reportedly showed the footage of the Apollo program, and the Demo-2 mission, which resurrected the human spaceflight capability of the United States. NASA prohibits the use of any of the NASA identities and emblem imagery in advertisements. NASA’s advertising regulations say that the space agency will not promote or endorse or appear to promote or endorse a commercial product, service or activity.

“Astronauts or employees who are currently employed by NASA cannot have their names, likenesses or other personality traits displayed in any advertisements or marketing material,” the regulations read.

Retired NASA astronaut Karen Nyberg, the wife of Doug Hurley who flew in the Dragon Crew spacecraft along with Bob Behnken, raised strong objection to the used of her photograph in the advertisement. Taking to Twitter, Nyberg said that she finds it “disturbing” that the video image was used without her consent. 

Read: NASA Astronauts Explain Difference Between SpaceX Dragon Crew’s Ride And Space Shuttle

Online petition

A Change.org petition was initiated to stop Trump from politicising accomplishments of SpaceX and NASA and has attracted nearly 7,000 signatures so far. The petition argued that the NASA Commercial Crew Program has been around in its current form since the Obama Administration, and its roots go back to the Bush Administration. 

It said that NASA and the space industry as a whole have long tried to stay out of politics, and, until this Administration, that goal was at least partially attained. The petition further added that implying any one person was responsible for the SpaceX-NASA Crew Demo-2 launch is an “insult to the work of the teams” that meaningfully contributed to its success.

Read: Newest NASA Arrivals Address Briefing LIVE From ISS; Toy Dragon & Earth Bauble In Tow

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