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We all know that black holes are destructive monsters. Their tremendous gravitational pull sucks in anything that gets in the way. This is particularly true for supermassive black holes in the hearts of galaxies. They can tear apart stars. And, every so often—like once every, 10,000 years, that happens. The star passes too close and the black hole’s gravity shreds it.

When a star experiences a “tidal disruption event” (TDE), it lights up the core of the galaxy. Astronomers know of about 100 of these TDEs in distant galaxies. Most of the light they detect from that catastrophic event arrives in the form of X-rays and optical light. But, it turns out they can tune into infrared signals from a TDE, and MIT scientists recently captured one occurring in the galaxy NGC 7392. The galaxy lies about 137 million light-years from Earth, and the discovery at its heart is one of the first times astronomers have seen an infrared view of star-shredding by a black hole.

They named the event “WTP14adbjsh.” Because dust clouds hid the view, there were no X-ray or ultraviolet views. However, the dust absorbed a great deal of radiation from the event, and that caused the clouds to emit infrared light.

Capturing a View of a Black Hole Shredding a Star

The discovery came about almost by accident as MIT postdoc Christos Panagiotou and his colleagues were combing through data from the NEOWISE mission. It has been making scans of the sky in infrared wavelengths since 2010. The team discovered a bright flash that appeared in the data. Panagiotou wasn’t looking for tidal disruption events, actually. The team was searching for transients—sources of light that appear and then disappear. Then, they discovered this flash. “We could see there was nothing at first,” Panagiotou recalled. “Then suddenly, in late 2014, the source got brighter and by 2015 reached a high luminosity, then started going back to its previous quiescence.”

Infrared signs of the closest tidal disruption event (TDE) to date. In this event, a star wandered too close to a central supermassive black hole. A bright flare was detected from the galaxy NGC 7392 in 2015 (top left panel). Observations of the same galaxy were taken in 2010-2011 (top right), prior to the TDE. The bottom left shows the difference between the first two images, representing the actual, detected TDE. For comparison, the bottom right panel shows the same galaxy in the optical waveband. Courtesy of the researchers
Infrared signs of the closest tidal disruption event (TDE) to date. In this event, a star wandered too close to a central supermassive black hole. A bright flare was detected from the galaxy NGC 7392 in 2015 (top left panel). Observations of the same galaxy were taken in 2010-2011 (top right), prior to the TDE. The bottom left shows the difference between the first two images, representing the actual, detected TDE. For comparison, the bottom right panel shows the same galaxy in the optical waveband. Courtesy of the researchers

They eventually traced the flash to NGC 7392 and began asking what kind of astrophysical process could create it. “For instance, supernovae are sources that explode and brighten suddenly, then come back down, on similar timescales to tidal disruption events,” Panagiotou said. “But supernovae are not as luminous and energetic as what we observed.”

Eventually, the team figured out that the flash was due to a TDE—that is, a star being ripped apart by a supermassive black hole. It fit the data and, if it panned out, was the closest one astronomers have ever observed.

Proving a TDE

It’s one thing to claim that the transient flash of light was a star getting shredded by a black hole, but how to prove it? First, the team had to understand the black hole and its environment. So, they studied the galaxy. Data from a variety of sources showed the galaxy had a supermassive black hole about 30 million times as massive as the Sun. That’s actually pretty massive. “This is almost 10 times larger than the black hole we have at our galactic center, so it’s quite massive, though black holes can get up to 10 billion solar masses,” Panagiotou said.

For a star to get close enough to encounter the black hole means the galaxy has a
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The Kuiper Belt is Much Bigger Than We Thought

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NASA’s New Horizons spacecraft is just over 8.8 billion km away, exploring the Kuiper Belt. This icy belt surrounds the Sun but it seems to have a surprise up its sleeve. It was expected that New Horizons would be leaving the region by now but it seems that it has detected elevated levels of dust that are thought to be from micrometeorite impacts within the belt. It suggests perhaps that the Kuiper Belt may stretch further from the Sun than we thought! 

The Kuiper Belt is found beyond the orbit of Neptune and is thought to extend out to around 8 billion km. Its existence was first proposed in the mid-20th century by Gerard Kuiper after whom the belt has been named. It’s home to numerous icy bodies and dwarf planets and offers valuable insight into the formation and evolution of the Solar System.

Launched by NASA in January 2006 atop an Atlas V rocket, the New Horizon’s spacecraft embarked on its mission to explore the outer Solar System. The primary objective was to perform a close flyby of Pluto, which it did 9.5 years after it launched, and continue on to explore the Kuiper Belt.

New Horizons completed its flyby of Pluto in 2015, and has been travelling through the Kuiper Belt since. As it travels through the outer reachers of the region, almost 60 times the distance from Earth to the Sun, its Venetia Burney Student Dust Counter (SDC) has been counting dust levels. The instrument was constructed by students at the Laboratory for Atmospheric Space Physics at the University of Colorado Boulder. Throughout New Horizon’s journey, SDC has been monitoring dust levels giving fabulous insight into collision rates among objects in the outer Solar System. 

The New Horizons instrument payload that is currently doing planetary science, heliospheric measurements, and astrophysical observations. Credit: NASA/Johns Hopkins University Applied Physics Laboratory/Southwest Research Institute
The New Horizons instrument payload that is currently doing planetary science, heliospheric measurements, and astrophysical observations. Credit: NASA/Johns Hopkins University Applied Physics Laboratory/Southwest Research Institute

The dust particle detections announced in a recent paper published in the Astrophysical Journal Letters by lead author Alex Doner are thought to be frozen remains from collisions between larger Kuiper Belt Objects (KBOs). The results were a real surprise and challenged the existing models that predicted a decline in dust density and KBO population. It seems that the belt extends many billions of miles beyond the current estimates or maybe even that there is a second belt!

The results came from data gathered over a three year period during New Horizon’s journey from 45 to 55 astronomical units (where 1 astronomical unit is the average distance between the Sun and Earth). While New Horizon’s was gathering data about dust, observatories such as the 8.2-meter optical-infrared Subaru Telescope in Hawaii have been making discoveries of new KBOs. Together these findings suggest the Kuiper Belt objects and dust may well extend a further 30 AUs out to about 80 AUs from the Sun.

New Horizons is now in its extended mission and hopefully has sufficient power and propellant to continue well into the 2040s. At its current velocity that will take the spacecraft out to about 100 AU from the Sun so the research team speculate that the SDC could identify the transition point into interstellar space.

Source : NASA’s New Horizons Detects Dusty Hints of Extended Kuiper Belt

The post The Kuiper Belt is Much Bigger Than We Thought appeared first on Universe Today.

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A Planetary Disk in the Orion Nebula is Destroying and Replenishing Oceans of Water Every Month

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Planet-forming disks are places of chaotic activity. Not only do planetesimals slam together to form larger worlds, but it now appears that the process involves the destructive recycling of water within a disk. That’s the conclusion from scientists studying JWST data from a planetary birth crèche called d203-506 in the Orion Nebula.

The data they studied suggest that an amount of water equivalent to all of Earth’s oceans is created and replenished in a relatively short period—about a month. According to study co-lead Els Peeters at Western University in Canada, it was relatively easy to discover this process in the protoplanetary disk. “This discovery was based on a tiny fraction of our spectroscopic data,” she said. “It is exciting that we have so much more data to mine and I can’t wait to see what else we can find.”

The Orion Nebula is a vast active star- and planet-forming region and the d203-506 protoplanetary disk lies within it at a distance of about 1,350 light-years away from Earth. Astronomers study the nebula to understand all aspects of star birth since there are so many newborn stars there. In addition, many are surrounded by disks of gas and dust, called protoplanetary disks (proplyds, for short). Those regions are excellent places to observe planet-formation processes, and particularly the interplay between the young stars and their disks.

The Orion Nebula, one of the most studied objects in the sky. It's likely that many of its protostars and their planetary disks contain water in some form. Image: NASA
The Orion Nebula is one of the most studied objects in the sky. Many of its protostars and their planetary disks likely contain water in some form. Image: NASA

The Water Cycle of a Proplyd

We all know that water is an important ingredient for life. It certainly played a role in creating and sustaining life on our planet. As it turns out, water is a significant fraction of the materials in a proplyd. In the infant Solar System, water existed throughout our proplyd long before any of the planets formed, largely in their icy form, either as icy bodies or locked into asteroids and planetesimals. It also exists in interstellar space.

This view of Earth’s horizon was taken by an Expedition 7 crewmember onboard the International Space Station, using a wide-angle lens while the Station was over the Pacific Ocean. A new study suggests that Earth's water didn't all come from comets, but likely also came from water-rich planetesimals.  Credit: NASA
This view of Earth’s horizon by an Expedition 7 crewmember onboard the International Space Station. A new study suggests that Earth’s water didn’t all come from comets, but likely also came from water-rich planetesimals. Credit: NASA

Most of Earth’s water got delivered to the forming planet over millions of years. It melted or outgassed to form the oceans, rivers, and lakes we see today. But, some fraction of the water in our system’s birth disk probably went through a “freeze-thaw” cycle within the disk. That happened when the Solar System was still just a disk of gas and dust. The water was essentially destroyed and then re-formed at higher temperatures.

We can’t see that effect anymore in our system. But, astronomers can point telescopes at other proplyds to see if the same process happens there. That’s what Peeters and her team did. They used JWST to look at d203-506. There, bright young stars flood the nearby regions in the proplyd with intense ultraviolet radiation. The UV breaks up water molecules to form hydroxyl molecules and that process also releases infrared light. JWST can search out that light and report back on how much hydroxyl
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The 12 Best Hikes in Utah’s National Parks

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By Michael Lanza

From natural arches, hoodoos, and hanging gardens to balanced rocks and towering mesas, slot canyons and vast chasms, the desert Southwest holds in its dry, searing, lonely open spaces some of America’s most fascinating and inspiring geology. The writer “Cactus Ed” Abbey no doubt had this region in mind when he said there “are some places so beautiful they can make a grown man break down and weep.” Much of it sits protected within southern Utah’s five national parks: Zion, Bryce Canyon, Arches, Canyonlands, and Capitol Reef.

The good news? Many of the best sights can be reached on dayhikes of anywhere from a couple hours to a full day.

A hiker below the Wall of Windows on the Peek-a-Boo Loop in Bryce Canyon National Park.
” data-image-caption=”Cyndi Hayes hiking below the Wall of Windows on the Peek-a-Boo Loop in Bryce Canyon National Park.
” data-medium-file=”https://i0.wp.com/thebigoutside.com/wp-content/uploads/2020/02/Bryce2-013-Wall-of-Windows-Peek-a-Boo-loop-Bryce-Canyon-UT.jpg?fit=300%2C199&ssl=1″ data-large-file=”https://i0.wp.com/thebigoutside.com/wp-content/uploads/2020/02/Bryce2-013-Wall-of-Windows-Peek-a-Boo-loop-Bryce-Canyon-UT.jpg?fit=900%2C598&ssl=1″ src=”https://i0.wp.com/thebigoutside.com/wp-content/uploads/2020/02/Bryce2-013-Wall-of-Windows-Peek-a-Boo-loop-Bryce-Canyon-UT.jpg?resize=900%2C598&ssl=1″ alt=”A hiker below the Wall of Windows on the Peek-a-Boo Loop in Bryce Canyon National Park.” class=”wp-image-43917″ srcset=”https://i0.wp.com/thebigoutside.com/wp-content/uploads/2020/02/Bryce2-013-Wall-of-Windows-Peek-a-Boo-loop-Bryce-Canyon-UT.jpg?resize=1024%2C680&ssl=1 1024w, https://i0.wp.com/thebigoutside.com/wp-content/uploads/2020/02/Bryce2-013-Wall-of-Windows-Peek-a-Boo-loop-Bryce-Canyon-UT.jpg?resize=300%2C199&ssl=1 300w, https://i0.wp.com/thebigoutside.com/wp-content/uploads/2020/02/Bryce2-013-Wall-of-Windows-Peek-a-Boo-loop-Bryce-Canyon-UT.jpg?resize=768%2C510&ssl=1 768w, https://i0.wp.com/thebigoutside.com/wp-content/uploads/2020/02/Bryce2-013-Wall-of-Windows-Peek-a-Boo-loop-Bryce-Canyon-UT.jpg?w=1200&ssl=1 1200w” sizes=”(max-width: 900px) 100vw, 900px” data-recalc-dims=”1″ />Cyndi Hayes hiking below the Wall of Windows on the Peek-a-Boo Loop in Bryce Canyon National Park.
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Hi, I’m Michael Lanza, creator of The Big Outside. Click here to sign up for my FREE email newsletter. Join The Big Outside to get full access to all of my blog’s stories. Click here for my e-books to classic backpacking trips. Click here to learn how I can help you plan your next trip.

The list below of the best dayhikes in southern Utah’s national parks derives from numerous trips I’ve made to each of these parks over the past three decades, including the 10 years I spent as a field editor for Backpacker magazine and even longer running this blog. Use my list as your compass, and I guarantee you will knock off the best hikes in these parks.

I’d love to read your thoughts about my list—and your suggestions for dayhikes that belong on it. Please share them in the comments section at the bottom of this story. I try to respond to all comments, and as I continue to explore more trails, I will regularly update this story.

A teenage boy hiking Angels Landing, Zion National Park.
” data-image-caption=”My son, Nate, hiking Angels Landing in Zion National Park.
” data-medium-file=”https://i0.wp.com/thebigoutside.com/wp-content/uploads/2019/09/Zion5-015-Angels-Landing-Zion-National-Park.-copy.-copy.jpg?fit=300%2C200&ssl=1″ data-large-file=”https://i0.wp.com/thebigoutside.com/wp-content/uploads/2019/09/Zion5-015-Angels-Landing-Zion-National-Park.-copy.-copy.jpg?fit=900%2C600&ssl=1″ src=”https://i0.wp.com/thebigoutside.com/wp-content/uploads/2019/09/Zion5-015-Angels-Landing-Zion-National-Park.-copy.-copy.jpg?resize=900%2C600&ssl=1″ alt=”A teenage boy hiking Angels Landing, Zion National Park.” class=”wp-image-35512″ srcset=”https://i0.wp
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