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Science, Inventions & Space Discuss Asteroids, Comets & Meteorites at the General Discussion; Crashed in a remote area near the Norwegian and Russian borders... Finns Want to Look for Remains of Arctic Meteorite ...

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Old 11-24-2017, 06:16 AM
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Crashed in a remote area near the Norwegian and Russian borders...

Finns Want to Look for Remains of Arctic Meteorite
November 22, 2017 — The remains of a blazing meteorite that lit up the dark skies of the Arctic last week are believed scattered near a lake in northern Finland, amateur Finnish astronomers said Wednesday.
The Ursa astronomical association says their calculations show the parts would have crashed in a remote area near the Norwegian and Russian borders. The meteorite - which Norwegian scientists said gave “the glow of 100 full moons” - was seen in northern Norway and Russia's Kola peninsula on Thursday for about five seconds.

Marko Pekkola, a scientist with Ursa, said it likely landed in the wilderness almost 1,000 kilometers (620 miles) north of Helsinki. He believed it weighted between 100 kilograms and 300 kilograms (220 pounds and 660 pounds) before it entered the atmosphere, and flew at a speed of 30 kilometers per second (18.6 miles per second) - “in the low end for meteorites.”

Pekkola said the meteorite likely broke into pieces when it entered the atmosphere, producing a blast wave that felt like an explosion. The parts are believed to be spread over an area of about 60 square kilometers (24 sq. miles). “We don't know many pieces are out there, it is [exceptional] to find something,” Pekkola said. “I can say that finding one or two pieces is possible.” The group says it wants to start searching for the remains, though it hasn't set a date yet.

In 2013, a meteorite streaked across the Russian sky and exploded over the Ural Mountains with the power of an atomic bomb, its sonic blasts shattering countless windows and injuring about 1,100 people. Many were cut by flying glass as they flocked to windows, curious about what had produced such a blinding flash of light. The 2013 Chelyabinsk meteorite was estimated to be about 10 tons when it entered the Earth's atmosphere at a hypersonic speed of at least 54,000 kph (33,000 mph). It shattered into pieces about 30-50 kilometers (18-32 miles) above the ground but some meteorite chunks were found in a Russian lake.

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Study: Earth’s Night Skies Getting Brighter
November 22, 2017 - Goodbye, Moon. We don’t need you anymore.
The Earth’s night skies are getting brighter. A study published Wednesday in the journal Science Advances, finds the Earth’s artificially lit outdoor areas grew by 2.2 percent per year from 2012 to 2016. Light pollution is actually worse than that, according to the German-led team of researchers. The measurements used in the study come from an imaging sensor on a polar-orbiting weather satellite that can’t detect the color blue generated by the new and increasingly popular LED lights, which means some light is missed by the sensor.

Overall, 79 countries, mostly in Asia, South America and Africa, experienced a growth in nighttime brightness. Sixteen countries, including areas of conflict such as Syria and Yemen, witnessed a decrease, and 39 countries, including the U.S., stayed the same. “Artificial light is an environmental pollutant that threatens nocturnal animals and affects plants and microorganisms,” the study said.

A couple enjoys the Perseid meteor along the Milky Way illuminating the dark sky, Aug. 12, 2017, near Comillas, Cantabria community, northern Spain, during the Perseids meteor shower.

Light pollution has been known to have adverse effects on all living creatures. People’s sleep can be marred, in turn affecting their health. The migration and reproduction of birds, fish, amphibians, insects and bats can be disrupted, and plants can have abnormally extended growing periods.

Co-author of the study, Franz Holker of the Leibniz Institute of Freshwater Ecology and Inland Fisheries in Berlin, said things are at the critical point. “Many people are using light at night without really thinking about the cost,” Holker said. Not just the economic cost, “but also the cost that you have to pay from an ecological, environmental perspective.”


Last edited by waltky; 11-24-2017 at 06:25 AM..
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