One of the last major steps before SpaceX flies its Crew Dragon craft with real NASA astronauts onboard is an “in-flight abort test.” Scheduled to take place during a four-hour window on Saturday, Sunday or Monday morning, it will test the vehicle’s ability to safely get back to Earth if there’s a problem during ascent.
Tomorrow’s test will demonstrate Crew Dragon’s ability to separate from Falcon 9 and carry astronauts to safety in the unlikely event of an emergency on ascent pic.twitter.com/Cji4S5JDHl
— SpaceX (@SpaceX) January 17, 2020
Last March, Crew Dragon successfully flew to the ISS and back, and if all goes well, a crewed flight could occur later this year. SpaceX is competing with Boeing’s Starliner in the NASA Commercial Crew program, so every test flight counts.
Come back here just before 8 AM ET on January 18th, and if the weather holds then you should see the Crew Dragon separate from its Falcon 9, then eventually land in the Atlantic Ocean. Even if you wake up a little late, keep an eye out — according to SpaceX, weather data suggests their best opportunity may be toward the end of the four-hour launch window.
— Elon Musk (@elonmusk) January 17, 2020
Astronomers detect biggest explosion since Big Bang – DW (English)
Researchers say the blast is the biggest since the universe began. It occurred at the center of a galaxy cluster some 390 million light years away from Earth.
Astronomers have discovered the biggest explosion seen in the universe, originating from a super-massive black hole.
The blast, they said, is the biggest explosion seen in the universe since the Big Bang. The explosion reportedly released five times more energy than the previous record holder.
Read more: What’s happening in the night sky in 2020?
The blast occurred at the center of the Ophiuchus cluster of galaxies, some 390 million light years away. The cluster is a conglomeration of thousands of galaxies, hot gas and dark matter bound together by gravity.
“We’ve seen outbursts in the centers of galaxies before but this one is really, really massive, ” said Melanie Johnston-Holitt, a professor at the International Center for Radio Astronomy Research (ICRAR). “And we don’t know why it’s so big.”
Astronomers used NASA’s Chandra X-Ray Observatory to make the discovery, as well as a European space observatory and ground telescopes. Scientists picked up the first sign of the explosion in 2016.
Chandra images of the cluster revealed an unusual curved edge, but scientists ruled out a possible eruption given the amount of energy that would have been needed to create such a large cavity of gas. The curviture was later confirmed to be a cavity.
According to ICRAR, the lead author of the study, Dr Simona Giacintucci from the Naval Research Laboratory in the United States, compared the blast to the 1980 eruption of Mount St. Helens, which tore the top off the mountain.
“The difference is that you can fit 15 Milky Way galaxies in a row into the crater this eruption punched into the cluster’s hot gas,” she said.
The blast is believed to be over by now, and, according to the research team, more observations are needed in other wavelengths to better understand what occurred.
We made this discovery with Phase 1 of the MWA, when the telescope had 2048 antennas pointed towards the sky,” said Johnston-Hollitt. “We’re soon going to be gathering observations with 4096 antennas, which should be 10 times more sensitive. I think that’s pretty exciting.”
lc/aw (AP, EFE)
Bright-Red "Blood Snow" Is Falling From the Sky in Antarctica – Futurism
A Facebook post by Ukraine’s Ministry of Education and Science shows a research station on an island just off the coast of Antarctica’s northernmost peninsula covered in “blood snow.”
The gory-looking scene is not the result of a seal hunt gone wrong — it’s an astonishingly red-pigmented, microscopic algae called Chlamydomonas nivalis, which thrives in freezing water as the ice melts during Antarctica’s record-breaking warm summer.
When summer hits the polar regions, the algae bloom, staining the snow and ice around it in blood-resembling red, as Live Science explains. The phenomenon was first noticed by Aristotle thousands of years ago and is often referred to as “watermelon snow” thanks to its subtly sweet scent and color.
What makes the blooming algae red is the same stuff that give carrots and watermelons their reddish tint — carotenoids.
It’s a stunning display of a natural phenomenon — but it also creates a nasty feedback loop that causes the ice to melt faster. The red color causes less sunlight to be reflected off the snow, causing it to melt faster, as the Ukrainian team explains in its post. The accelerated melting then causes more algae to grow, completing the cycle.
It’s not the only surreal display in the world caused by such a feedback loop, as Live Science points out. Blooming algae caused sea foam to swallow up the coast of a Spanish town in January. Similar algae blooms even caused shores around islands in the East China Sea to glow blue.
READ MORE: Spooky ‘blood snow’ invades Antarctic island [Live Science]
More on algae: A New Bioreactor Captures as Much Carbon as an Acre of Trees
Scientists detect biggest explosion since Big Bang – BBC News
Scientists have detected evidence for a colossal explosion in space – five times bigger than anything observed before.
The huge release of energy is thought to have emanated from a supermassive black hole some 390 million light years from Earth.
The eruption is said to have left a giant dent in the Ophiuchus galaxy cluster.
Researchers reported their findings in The Astrophysical Journal.
They had long thought there was something strange about Ophiuchus galaxy cluster, which is a giant aggregation containing thousands of individual galaxies intermingled with hot gas and dark matter. X-ray telescopes had spied a curious curved edge to it.
The speculation was that this might be the wall of a cavity that had been sculpted in its gas by emissions from a central black hole.
Black holes are famous for gorging on infalling matter, but they will also expel prodigious amounts of material and energy in the form of jets.
Scientists at first doubted their explanation however, because the cavity was so big; you could fit 15 of our own Milky Way galaxies in a row into the hole.
And that meant any black hole explosion would have to have been unimaginably prodigious.
But new telescope data from the Murchison Widefield Array (MWA) in Australia and the Giant Metrewave Radio Telescope (GMRT) in India seem to confirm it.
“In some ways, this blast is similar to how the eruption of Mount St Helens (volcano) in 1980 ripped off the top of the mountain,” said Simona Giacintucci of the Naval Research Laboratory in Washington, DC, and lead author of the study.
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