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Mars Base

45 meter Asteroid to Skirt Very Near Earth on Feb 15 - 0 views

www.universetoday.com/...kirt-very-near-earth-on-feb-15

scibyte82 NearEarthObject

shared by Mars Base on 13 Feb 13 - No Cached
  • Friday (Feb. 15)
  • a space rock roughly half a football field wide skirts very close by Earth
  • well inside the
  • ...11 more annotations...
  • expensive communications and weather satellites that ring around us in geosynchronous orbit
  • no possibility of an Earth impact
  • altitude of 27,700 kilometers (17,200 miles). That is some 8000 km (5000 miles) inside the ring of geosynchronous satellites
  • if an asteroid the size of 2012 DA14 fell to Earth, the impact effect would be similar to the 1908 Tunguska event in Siberia
  • the K-T event that caused the mass extinction of the dinosaurs some 65 million years ago was caused by an asteroid about 10 km (6 mi) in diameter
  • no danger to the ISS crew and apparently they won’t have any chance to observe it.
  • ISS is not positioned right for observations
  • “No NASA space-based assets will be making measurements
  • asteroid is moving to fast
  • radar astronomers do plan to take images around eight hours after the flyby using the Goldstone antenna in California’s Mojave Desert
  • 2012 DA 14
Mars Base

Newsflash: Lightning May Cause Headaches - News Watch - 0 views

newswatch.nationalgeographic.com/...-lightning-may-cause-headaches

scibyte82 lightning

shared by Mars Base on 13 Feb 13 - No Cached
  • The study found a shocking 31 percent increase of the risk of headache and a 28 percent increased risk of migraine for chronic headache sufferers on days that lightning struck within 25 miles (40 kilometers) of their homes
  • Furthermore, new-onset headaches and migraines increased by 24 percent and 23 percent, respectively
  • new study is the first to show a correlation between lightning and associated weather phenomena and the squalls in our heads
  • ...6 more annotations...
  • results “suggest that lightning has its own unique effect on headache
  • how exactly lightning might trigger headaches
  • there are a number of possible explanations
  • Electromagnetic waves emitted from lightning could trigger headaches
  • lightning produces increases in air pollutants like ozone, and can cause release of fungal spores that might lead to migraine
  • while the study sheds light on the apparent link between lightning and headaches, “the exact mechanisms through which lightning and/or its associated meteorologic factors trigger headache are unknown
Mars Base

Airburst Explained: NASA Addresses the Russian Meteor Explosion - 0 views

www.universetoday.com/...s-the-russian-meteor-explosion

scibyte82 RussianMeteor

shared by Mars Base on 16 Feb 13 - No Cached
  • traveled through the atmosphere for about 30 seconds before breaking apart and producing violent airburst ‘explosion’ about 20-14 km (12-15 miles) above Earth’s surface
  • producing an energy shockwave equivalent to a 300 kilotons explosion
  • The Russian meteor is the largest reported since 1908, when a meteor hit Tunguska, Siberia
  • ...3 more annotations...
  • Tunguska event was caused by an object about the size of 2012 DA14
  • The meteor, which was about one-third the diameter of asteroid 2012 DA14, became brighter than the Sun
  • Its trail was visible for about 30 seconds, so it was a grazing impact through the atmosphere
Mars Base

Russia meteor virtually impossible to see coming | Atom & Cosmos | Science News - 0 views

www.sciencenews.org/...ually_impossible_to_see_coming

scibyte82 RussianMeteor

shared by Mars Base on 17 Feb 13 - No Cached
  • Scientists have begun piecing together the characteristics of the meteor that exploded over Russia on the morning of February 15, using data from seismic instruments that track earthquakes and microphones designed to detect sonic booms from nuclear explosions
  • The explosion had the equivalent of up to 500,000 tons of TNT
  • about 30 times the energy output of the Hiroshima atomic bomb
  • ...1 more annotation...
  • only 5 percent of the energy of the famous 1908 Tunguska meteor that downed trees over a 2,000-square-kilometer area in Siberia
Mars Base

Russian Meteor Blast Bigger Than Thought, NASA Says | Space.com - 0 views

www.space.com/-meteor-blast-bigger-size.html

scibyte82 RussianMeteor

shared by Mars Base on 17 Feb 13 - No Cached
  • 16 February 2013
  • NASA revised its estimates on the size and power of the devastating meteor explosion
  • now thought to be slightly larger — about 55 feet (17 m) wide — with the power of the blast estimate of about 500 kilotons, 30 kilotons higher than before
  • ...6 more annotations...
  • also substantially more massive than thought
  • Initial estimated pegged the space rock's mass at about 7,000 tons
  • the meteor weighed about 10,000 tons and was travelling 40,000 mph (64,373 km/h) when it exploded
  • new estimates were generated using new data that had been collected by five additional infrasound stations located around the world
  • the first recording of the event being in Alaska, over 6,500 kilometers away
  • infrasound stations detect low-frequency sound waves that accompany exploding meteors, known as bolides
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