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Watch SpaceX launch its latest batch of Starlink satellites, including one with a sun visor – TechCrunch

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SpaceX just launched its most important and historic launch ever this past weekend, flying NASA astronauts for the first time – on Wednesday, it’s set to follow that up with a less significant Falcon 9 rocket launch, but one that’s still vital to the company’s future. This mission is the latest of SpaceX’s Starlink launches, which the company is using to put up a vast network of small satellites to provide low-cost, high-bandwidth internet access to customers globally.

SpaceX’s Starlink mission today has a launch window of 9:25 PM EDT (6:25 PM PDT) and includes a payload of 60 more satellites for the constellation, which already has 420 operating in low Earth orbit. The goal is ultimately to launch as many as 40,000 or of these small satellites in order to blanket the globe with connectivity that’s broadly available, and that provides rock solid network consistency by handing off connections among the satellites as they make their way around the Earth.

This launch was originally scheduled to fly the week prior to SpaceX’s Demo-2 crewed mission, which carried NASA astronauts Bob Behnken and Doug Hurley to the International Space Station on Saturday and Sunday, but was bumped due to a scheduling conflict with a ULA launch, and then further postponed until after the astronaut flight. It’s still already the fifth batch of 60 Starlink satellites that SpaceX has flown in 2020. In total, SpaceX is hoping for up to two dozen Starlink launches in total before year’s end, which will help it meet its goal of launching an initial beta service in Canada and the U.S. later this year, with a more global rollout following in 2021 or 2022.

This launch will take off from Cape Canaveral Air Force Station in Florida, and will use a Falcon 9 first stage that flew previously on four previous missions. SpaceX will attempt to recover the booster again through a controlled landing, and will also try to catch the fairing halves used to protect the satellite cargo using its ‘Ms. Tree’ and ‘Ms. Chief’ ships.

One key novel element for this flight is the test of a new technology SpaceX is hoping will help mitigate the impact of the Starlink constellation on night sky observation from Earth. Scientists have complained that Starlink is bright enough to interfere with sensitive optical instrumentation used to gather data deep space bodies and phenomena. To address that, SpaceX has designed a deployable ‘visor’ system which extends from Starlink satellites post-launch and attempts to block sunlight reflecting off of their communications arrays.

SpaceX has equipped one of the 60 satellites on this launch with that system, as way of testing its efficacy before making it a standard part of the Starlink satellite build going forward. Depending on results, it could become a permanent fixture on all SpaceX’s Starlink spacecraft for future missions.

Should today’s launch be delayed (weather is currently looking around 60% favorable for the mission), there’s a backup opportunity tomorrow, June 4 at 9:03 PM EDT (6:03 PM PDT).

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Fastest-Growing Black Hole as Big as 34 Billion Suns – Nerdist

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The fastest-growing black hole ever observed has been given an approximate weight, and it tips the scale at 34 billion times the mass of the Sun. The researchers who’ve estimated its weight also say it continues to grow, devouring a Sun’s worth of matter per day. On top of claiming those mondo stats, the gorging monster may also help to unlock some key mysteries of the early universe.

European Southern Observatory 

The “ultramassive black hole” (that’s literally a class of black hole), dubbed J2157-3602, was discovered in 2018 and given an initial weight of 20 billion solar masses—a solar mass is a unit of mass equivalent to the mass of the Sun. Since then, researchers have gone back and taken new measurements using the Very Large Telescope array in Chile. (Pictured immediately below.)

J2157 is “about 8,000 times bigger than the black hole in the centre of the Milky Way,” astronomer Christopher Onken of Australian National University told Science Alert. He added that “If the Milky Way’s black hole wanted to grow that fat, it would have to swallow two thirds of all the stars in our galaxy.”

The fastest-growing black hole in the universe has been pegged at 34 billion solar masses.

ESO/H.H. Heyer

Onken and others described these new measurements in a paper recently published in the journal, Monthly Notices of the Royal Astronomical SocietyIn the paper, which comes via ZME Science, the researchers say that the ultramassive black hole is, on top of being gargantuan, also the most luminous quasar in the known universe. A quasar—pictured at top—is essentially a black hole that’s actively pulling in gas and dust from a surrounding accretion disk. In other words, a “feeding” black hole.

Although J2157 is huge beyond imagination, it isn’t the most massive black hole we’ve ever observed. That title belongs to an ultramassive black hole powering the quasar known as TON 618, which is about 10.4 billion light-years away from Earth. That indescribably large light-swallowing beast weighs in at 66 billion solar masses. Below, for visual reference, is a comparison of all the differently sized black holes.

Like TON 618, J2157 is also astoundingly far from Earth. According to Science Alert, J2157 is some billions of light-years away. However, the measurement isn’t as exact as that for TON 618. J2157 can still help to illuminate the very early universe, however, when it was younger than 1 billion years old. Especially when it comes to gleaning information about the galaxy in which it resides.

[embedded content]

“Is this galaxy one of the behemoths of the early Universe, or did the black hole just swallow up an extraordinary amount of its surroundings?” Onken asked rhetorically. Depending on the answer to that question, cosmological models explaining how the universe has grown over time could be altered. Right now, astronomers are still just trying to figure out how black holes can grow to be as massive as J2157 so early on in the universe’s existence.

What do you think about J2157 and its ability to swallow a Sun’s worth of mass every single day? Do you have any ideas as to how the ultramassive hole will change our understanding of the early universe? Let us know your thoughts in the comments!

Feature image: European Southern Observatory 

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'Very little risk' that pets can infect owners with COVID-19: WHO – Edmonton Sun

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GENEVA — There is ‘very little risk’ that pets can infect their owners with COVID-19, the chief scientist of the World Health Organization (WHO) said on Thursday.

Soumya Swaminathan, WHO chief scientist, told a Geneva news conference that felines, ferrets and “even tigers” have been infected with the disease.

“There is very little risk from domestic animals because there was some concern about domestic animals becoming a source of infection,” she said.

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Canadian sparrows changing their tune – Bangkok Post

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The white-throated sparrow of North America, whose singing preferences are the subject of a new study.

WASHINGTON: Members of a Canadian sparrow species famous for their jaunty signature song are changing their tune, a curious example of a “viral phenomenon” in the animal kingdom, a study showed Thursday.

Bird enthusiasts first recorded the white-throated sparrow’s original song, with its distinctive triplet hook, in the 1950s.

Canadians even invented lyrics to accompany the ditty: “Oh my sweet, Ca-na-da, Ca-na-da, Ca-na-da.”

But starting from the late 20th century, biologists began noticing that members of the species in western Canada were innovating.

Instead of a triplet, the new song ended in a doublet and a new syncopation pattern. The new ending sounded like “Ca-na, Ca-na, Ca-na.”

Over the course of the next two decades, this new cadence became a big hit, moving eastward and conquering Alberta, then Ontario. It began entering Quebec last year.

It’s now the dominant version across more than 2,000 miles (3,000 kilometers) of territory, in an extremely rare example of the total replacement of historic bird dialect by another.

Scientist Ken Otter at the University of Northern British Columbia, and his colleague Scott Ramsay from Wilfrid Laurier University, described the dizzying pace of this transformation in the journal Current Biology.

“What we’re seeing is like somebody moving from Quebec to Paris, and all the people around them saying, ‘Wow, that’s a cool accent’ and start adopting a Quebec accent,” Otter told AFP.

Their work was based on 1,785 recordings between 2000 and 2019, the majority made by them but with contributions from citizen-scientists, who posted the files on specialist sites like xeno-canto.org.

In the western province of Alberta, about half of the recorded songs ended with the triplet in 2004; ten years later, all the males had adopted the doublet.

In 2015, half of western Canada had converted to the doublet version, and by last year, the new song had been well established on the western tip of eastern Quebec province.

At this rate, the historic triplet version may soon exist only in tape recordings.

Bird influencers

The males of the species sing to mark their territory, and their songs all share a common structure. Usually, if a variation appears, it remains regional and doesn’t make headway in neighboring territories.

The study represents the first time scientists have been able to show this kind spread at huge geographic scale, said Otter.

So how did it happen?

Probably in the same way that children return from summer camp humming new tunes: songbirds from different parts of Canada winter in the same parts of the United States, then return to their own homes in spring.

The researchers verified this theory by tagging a few of the birds.

So it was that in the plains of Texas and Kansas, the new song’s first adopters from western Canada — avian influencers, if you will — popularized the trend among their eastern brethren.

Previous work has shown that young birds can pick up a foreign song after listening to a recording.

But to truly understand why the males were willing to abandon the old song that had once served them well, the scientists have to rely on theories.

Otter believes it may be because females were more attracted to the new song, so young males rushed to adopt it.

“There seems to be some advantage to adding novel elements into your song that make the song, not necessarily more attractive, but increases people’s attention to it,” said Otter.

Going back to the human example, it would be akin to “if all the French women in Paris thought that a Quebec accent sounded much more interesting than a Parisian accent, and so everybody starts adopting a Quebec accent.”

The hypothesis remains unverified.

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