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 Post subject: Re: Meteorite thread
PostPosted: Thu Jan 05, 2017 7:59 am 
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NASA Unveils New Missions to Bizarre Asteroids

https://www.scientificamerican.com/arti ... asteroids/

Quote:
Psyche will explore one of the oddest objects in the solar system — a 130-mile-wide (210 kilometers) metallic asteroid that may be the core of an ancient, Mars-size planet. Violent collisions billions of years ago might have stripped away the layers of rock that once lay atop this metallic object, scientists say.

“This is an opportunity to explore a new type of world — not one of rock or ice, but of metal,” said Psyche principal investigator Lindy Elkins-Tanton, of Arizona State University.“ 16 Psyche is the only known object of its kind in the solar system, and this is the only way humans will ever visit a core. We learn about inner space by visiting outer space.”

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 Post subject: Re: Meteorite thread
PostPosted: Tue Jan 24, 2017 2:31 pm 
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No urban legend: Our rooftops are collecting stardust

http://arstechnica.com/science/2017/01/ ... -stardust/

Quote:
Faced with about 300kg of roof debris, the authors separated the material using a combination of magnets and physical shape—micrometeorites are spherical because they melt during atmospheric entry and are shaped by the air. From that 300kg, the researchers isolated 500 particles, all just a few hundred micrometers across, that looked like they were micrometeorites. Forty-eight of them were chosen for detailed analysis.

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 Post subject: Re: Meteorite thread
PostPosted: Tue Jan 24, 2017 4:53 pm 
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A Brilliant Green Meteor Lights Up India’s ‘Sky Islands’

https://www.wired.com/2017/01/bright-gr ... ins-india/

It's all about the photo, fam.

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 Post subject: Re: Meteorite thread
PostPosted: Tue Jan 24, 2017 7:09 pm 
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A Star Heading Towards Our Solar System Will Knock Millions Of Asteroids Towards Earth

http://www.physics-astronomy.com/2017/0 ... ystem.html

Quote:
According to a research paper published in the journal Astronomy & Astrophysics, Gliese 710 is nearly half the size of our Sun, and is set to reach Earth in 1.35 million years. And when it reaches, the star could end up a only 77 light-days away from Earth - one light-day being the equivalent of how far light travels in one day, which is about 16 billion miles (26 billion kilometres), the astronomers worked out.


Disregard the typo of "rouge" as I'm certain the article's author meant "rogue".

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 Post subject: Re: Meteorite thread
PostPosted: Tue Jan 24, 2017 7:10 pm 
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Tunguska Event Meteorite Theory Debunked By Russian Scientists

http://www.inquisitr.com/3901193/tungus ... cientists/

Quote:
“The study showed that the deepest sample is about 280 years old, which means that the lake is probably even older, because the researchers did not manage to obtain samples from the very bottom. Nevertheless, this proves that Lake Cheko is much older than the Tunguska event and is not an impact crater of a supposed Tunguska meteorite impact.”

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 Post subject: Re: Meteorite thread
PostPosted: Sun Jan 29, 2017 6:27 pm 
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Ancient Meteorites Were Different

https://blogs.scientificamerican.com/li ... different/

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In other words, most of the rocky meteorites we've been used to during human history could be a bit of a glitch, the result of a specific set of asteroid breakups - coming from perhaps no more than three particular parent bodies. Those collisions are thought to have all occurred within the past 466 million years.

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 Post subject: Re: Meteorite thread
PostPosted: Mon Feb 06, 2017 2:57 pm 
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Mysterious Sounds Made by Meteors Explained

http://mysteriousuniverse.org/2017/02/m ... explained/

Quote:
Richard Spalding led a team of researchers at Sandia National Laboratories (owned by Lockheed Martin) who published the results of their study recently in the journal Scientific Reports. They found that the first thing most witnesses notice about a meteor is its brightness. They’re brighter than any other object in the sky (sorry Moon) and often the light is pulsating. The second thing many witnesses notice about these pulsing meteors is their heat. Although the streaking space rock is 60 miles or more away, they experience the sensation of heat and that sensation is linked to hearing the sounds of the meteor.


This site is good for listening to meteor echoes. Right now the feature isn't available :(

http://www.livemeteors.com/

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 Post subject: Re: Meteorite thread
PostPosted: Mon Feb 06, 2017 2:58 pm 
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As meteor lights Midwestern skies, Lisle cop captures 'giant green-lighted orb' on dashcam

http://www.chicagotribune.com/news/loca ... story.html

Quote:
Early Monday morning, Dexter was on routine patrol near an apartment complex on Blackhawk Lane near Interstate 88 when he saw “a giant green-lighted orb” streaking across the sky.


Features the dashcam video.

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 Post subject: Re: Meteorite thread
PostPosted: Sun Feb 12, 2017 12:59 pm 
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Asteroid Resembles Dungeons and Dragons Dice

http://www.astrowatch.net/2017/02/aster ... agons.html

Quote:
“The radar images show relatively sharp corners, flat regions, concavities, and small bright spots that may be boulders,” said Lance Benner of NASA’s Jet Propulsion Laboratory in Pasadena, California, who leads the agency’s asteroid radar research program. “Asteroid 2017 BQ6 reminds me of the dice used when playing Dungeons and Dragons. It is certainly more angular than most near-Earth asteroids imaged by radar.”

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 Post subject: Re: Meteorite thread
PostPosted: Sun Feb 12, 2017 1:18 pm 
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Here's the original news release, with some more info...

http://www.jpl.nasa.gov/news/news.php?feature=6742

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 Post subject: Re: Meteorite thread
PostPosted: Tue Feb 14, 2017 8:43 am 
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New Research Into the Mystery of Anomalous Meteor Sounds

http://dailygrail.com/Fresh-Science/201 ... eor-Sounds

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 Post subject: Re: Meteorite thread
PostPosted: Tue Feb 14, 2017 6:05 pm 
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Meteorites Date Demise of Solar Nebula

http://www.skyandtelescope.com/astronom ... ar-nebula/

Quote:
The team tested the angrites using a precision magnetometer at the MIT Paleomagnetism Laboratory and found remnant magnetism so weak, it could have only been produced in an extremely weak magnetic field of no more than 0.6 microteslas about 3.8 million years after the solar system's formation. By contrast, back in 2014 the same team had looked at even older meteorites, which had formed 2 to 3 million years after the solar system, and found evidence for a magnetic field of 5 to 50 microteslas pervading the early solar system.

The more than tenfold drop in the strength of the solar nebula's magnetic field indicates that the nebula itself had all but dissipated by 3.8 million years after the solar system's birth.

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 Post subject: Re: Meteorite thread
PostPosted: Tue Mar 07, 2017 6:30 pm 
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New class of metal-organic compounds found in meteorites

http://www.seti.org/seti-institute/news ... meteorites

Quote:
This study is an unexpected byproduct of past case studies of meteorite falls led by SETI Institute meteor astronomer and co-author Peter Jenniskens. When these pristinely recovered meteorites were presented to the German team led by Ph. Schmitt-Kopplin of the Helmholtz Center and Technical University in Munich, they measured the methanol-soluble organic compounds at very high mass resolution. Even severely heated and shocked meteorites were found to contain traces of organic compounds. Upon further study, they discovered that many of the surviving compounds had to also contain a metal atom. These metal-organic compounds were identified as mostly di-hydroxy-magnesium carboxylates, a previously unrecognized chemical class. They appear to be a product of impact synthesis and after they are formed in the solid matter of planetesimals, they survive heat and pressure well.

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 Post subject: Re: Meteorite thread
PostPosted: Tue Mar 14, 2017 4:21 pm 
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When a meteor landed near Glasford

http://www.pjstar.com/news/20170220/nic ... r-glasford

Quote:
Similar meteor-impact areas are found near Des Plaines, a Chicago suburb, and Kentland, Ind. The Glasford site might be the result of an asteroid-belt collision that resulted in multiple Midwestern meteor impact areas, Monson suggested. It's also possible the Glasford area was part of a meteor shower spread over millions of years.

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 Post subject: Re: Meteorite thread
PostPosted: Fri Mar 24, 2017 9:52 pm 
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Space Rock Mystery: Where Did the Fukang Meteorite Come From?

http://www.ancient-origins.net/unexplai ... ome-007774

Quote:
The exact origins of the Fukang Meteorite, as well as other Pallasites are not entirely clear. Nevertheless, it has been speculated that they originated from the boundary of a melted and differentiated asteroid and its surrounding olivine mantle. The Fukang Meteorite is thought to have been formed at the birth of the solar system approximately 4.5 billion years ago, when the olivine fragments from its mantle mixed with the molten metal from its core upon impact on earth.

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 Post subject: Re: Meteorite thread
PostPosted: Mon Mar 27, 2017 9:49 am 
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Visualizing the Cosmic Streams That Spew Meteor Showers

https://www.nytimes.com/2017/03/24/scie ... owers.html

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Quote:
Now, astronomers and engineers have created an animation that lets you witness the entire journey. Using data from the Cameras for Allsky Meteor Surveillance, a network of about 60 cameras pointed at the sky above San Francisco Bay, researchers have recorded more than 300,000 meteoroid trajectories since 2010. They plan to use the data to confirm more than 300 potential meteor showers that scientists have observed, but not verified.

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 Post subject: Re: Meteorite thread
PostPosted: Sat Apr 01, 2017 8:09 pm 
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Locals Join Search for Possible Meteor Crash Site in Siberia

http://www.astrowatch.net/2017/04/local ... eteor.html

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 Post subject: Re: Meteorite thread
PostPosted: Tue Apr 18, 2017 5:15 pm 
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How (inaccurately) the Inland Empire reacted to a meteor in 1901

http://www.dailybulletin.com/science/20 ... or-in-1901

Quote:
(N)ews reports said the meteor lit up the sky as far south as San Diego and east to Flagstaff, Arizona, and probably broke up into a billion bits above the Earth many miles away. The inaccuracy of the local accounts could be the result of a party atmosphere that Saturday night fueled by alcohol.

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 Post subject: Re: Meteorite thread
PostPosted: Sun Apr 23, 2017 4:15 pm 
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Daytime meteor snapped by a redditor.

https://i.imgur.com/LQZ7OHO.jpg

Can you see it?

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 Post subject: Re: Meteorite thread
PostPosted: Fri May 05, 2017 7:32 am 
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Ancient Meteorite Impact Sparked Long-Lived Volcanic Eruptions on Earth

http://www.astrowatch.net/2017/05/ancie ... -long.html

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 Post subject: Re: Meteorite thread
PostPosted: Sat May 27, 2017 11:35 am 
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‘Tiny Clocks’ Crystallize Understanding of Meteorite Crashes

http://www.astrowatch.net/2017/05/tiny- ... nding.html

Quote:
Shock waves from that meteorite impact deformed the minerals that made up the rock beneath the crater, including small, tough crystals that contain trace amounts of radioactive uranium and lead. “These can be used as tiny clocks that are the basis for our geologic time scale,” Moser said. “But because these crystals are a banged-up mess, conventional methods won’t help in extracting age data from them.”

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 Post subject: Re: Meteorite thread
PostPosted: Tue May 30, 2017 6:18 pm 
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The annual Taurids meteor shower is hiding asteroids that could wipe out ENTIRE continents, experts warn

http://www.dailymail.co.uk/sciencetech/ ... roids.html

Quote:
They have found two asteroids, called 2015 TX24 and 2005 UR, which are part of a previously undiscovered branch of the Taurids' debris.

The Earth only passes through this potentially dangerous branch once every few years, causing greater numbers of shooting stars.

Future encounters are predicted for 2022, 2025, 2032 and 2039.

The space rocks measure 650 feet to 900 feet (200 to 300 meters) across and have been registered on the International Astronomical Union’s list of "potentially hazardous" asteroids.

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 Post subject: Re: Meteorite thread
PostPosted: Mon Jun 05, 2017 6:23 pm 
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Why you can hear and see meteors at the same time

https://www.sciencenews.org/article/why ... -same-time

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 Post subject: Re: Meteorite thread
PostPosted: Sun Jun 11, 2017 8:45 am 
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Comet Strikes May Have Helped Spur Life on Earth

https://www.seeker.com/space/comet-stri ... e-on-earth

Quote:
A new study suggests that about 20 percent of the noble gas xenon in Earth's atmosphere was delivered by comets long ago. And these icy wanderers likely brought lots of other stuff to our planet as well, researchers said.

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 Post subject: Re: Meteorite thread
PostPosted: Fri Jun 23, 2017 6:30 pm 
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Magnetic Memories of a Metal World

http://www.astrowatch.net/2017/06/magne ... world.html

Quote:
The study, led by a Fellow at St John’s College, Cambridge, Dr James Bryson, reveals the hidden magnetic messages in a rare group of metal meteorites which scientists believe are from Psyche. The results indicate that Psyche had a strong and unstable magnetic field and support the hypothesis that the asteroid is an exposed planetary core that cooled quickly due to the absence of a rocky mantle. These conclusions about Psyche, reached in the laboratory, will now be tested by an eponymous mission to outer space.

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