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Mars Base

Destination: Missing--Comet Once Targeted by NASA Mission Vanished: Scientific American - 0 views

www.scientificamerican.com/article.cfm

scibyte69 comet

shared by Mars Base on 24 Oct 12 - No Cached
  • n 2005, after NASA's Deep Impact spacecraft had completed its objective of slamming an impactor probe into the nucleus of Comet Tempel 1, mission scientists began plotting their next move.
  • spacecraft that had released the probe and documented its cometary collision was intact, with fuel to spare, leaving it well equipped to rendezvous with another comet in the inner solar system
  • Comets preserve some of the primordial materials from the early solar system
  • ...10 more annotations...
  • prospect of visiting another comet without having to build and launch a new spacecraft
  • seemed too good to pass up
  • best option, it seemed, was a comet called 85P/Boethin
  • would be drawing close to Earth in 2008
  • Comet Boethin had not been sighted in almost 20 years
  • seen on only two occasions—at its 1975 discovery and on its subsequent orbit around the sun, in 1986
  • roughly 11-year elliptical orbit placed it in the class of so-called short-period comets
  • another pass through the inner solar system in 1997
  • positioned on the opposite side of the sun from Earth, precluding astronomers from getting another look at it
  • 2008, when Boethin was to return once more
Mars Base

Quasar may be embedded in unusually dusty galaxy - 0 views

phys.org/...ed-unusually-dusty-galaxy.html

scibyte69 quasar

shared by Mars Base on 24 Oct 12 - No Cached
  • Quasars (short for quasi-stellar object) are the brilliant cores of galaxies where infalling material fuels a super-massive black hole
  • black hole is so engorged that some of the energy escapes as powerful blasts of radiation from the surrounding disk of accreting material
  • can appear as a jet-like feature
  • ...4 more annotations...
  • If the beam shines in Earth's direction
  • can appear as a quasar that can outshine its surrounding galaxy a hundred or a thousand times.
  • first identified in the Sloan Digital Sky Survey (SDSS).
  • Only a handful of these very distant ultra-luminous quasars were found by the SDSS in about one quarter of the whole sky
Mars Base

InteraXon looking for crowdfunding for Muse, a brainwave-sensor headband (w/ Video) - 0 views

phys.org/...brainwave-sensor-headband.html

scibyte69

shared by Mars Base on 24 Oct 12 - No Cached
  • crowd source funding site
  • Muse is a headband device based on electroencephalography (EEG) sensor technology combined with a sophisticated smartphone app that allows the wearer's brainwaves to be monitored.
  • sensors
  • ...4 more annotations...
  • monitor alpha (resting state) and beta (active state) brainwaves
  • converted to a signal that is broadcast, via Bluetooth technology, to the user's smartphone
  • claims that Muse can be used to learn new ways to relax, recognize lapses in concentration, build self-confidence, and gain more control of one's thoughts, overall
  • app includes a series of lessons and exercises designed to teach the user how to manipulate brain waves using visual feedback
Mars Base

Quasar - Wikipedia, the free encyclopedia - 0 views

en.wikipedia.org/Quasar

scibyte69 quasar

shared by Mars Base on 26 Oct 12 - Cached
  • size is 10–10,000 times the Schwarzschild radius of the black hole
  • powered by an accretion disc around the black hole.
  • among the most luminous, powerful, and energetic objects known in the universe
  • ...2 more annotations...
  • emit up to a thousand times the energy output of the Milky Way.
  • More than 200,000 quasars are known
Mars Base

Soyuz Spacecraft Docks at Space Station with New US-Russian Crew | Space.com - 0 views

www.space.com/space-station-docking-day.html

scibyte69 iss

shared by Mars Base on 26 Oct 12 - No Cached
  • 25 October 2012
  • Soyuz TMA-06M spacecraft docked at the space station's rooftop Poisk module at 8:29 a.m. EDT (1229 GMT)
  • two-day orbital chase
  • ...12 more annotations...
  • American astronaut Kevin Ford of NASA
  • Russian cosmonauts Oleg Novitskiy
  • Evgeny Tarelkin
  • stay until March
  • launched into space on Tuesday (Oct. 23
  • second half of the space station's six-person Expedition 33 crew
  • bringing some fishy friends to the space station
  • ferrying 32 small medaka fish to the space station so they can be placed inside a tank, called the Aquatic Habitat, for an experiment to study how fish adapt to weightlessness.
  • robotic Dragon space capsule
  • depart the space station on Sunday (Oct. 28)
  • will return nearly 2,000 pounds (907 kilograms) of science experiment hardware and other gear back to Earth.
  • Wednesday (Oct. 31), an unmanned Russian Progress spacecraft will launch toward the space station and arrive six hours later to make a Halloween delivery of food, equipment and other Halloween treats.
Mars Base

Maya demand an end to doomsday myth - 0 views

phys.org/...maya-demand-doomsday-myth.html

scibyte69 MayanCalender

shared by Mars Base on 26 Oct 12 - No Cached
  • Guatemala's Mayan people accused the government and tour groups on Wednesday of perpetuating the myth that their calendar foresees the imminent end of the world for monetary gain.
  • Culture Ministry is hosting a massive event in Guatemala City—which as many as 90,000 people are expected to attend
  • tour groups are promoting doomsday-themed getaways.
  • ...6 more annotations...
  • Maya leader Gomez urged the Tourism Institute to rethink the doomsday celebration, which he criticized as a "show" that was disrespectful to Mayan culture.
  • Oxlajuj Ajpop is holding events it considers sacred in five cities to mark the event and Gomez said the Culture Ministry would be wise to throw its support behind their real celebrations
  • The Mayan calendar has
  • 18 months of 20 days each plus a sacred month, "Wayeb," of five days
  • B'aktun" is the larget unit in the time cycle system, and is about 400 years
  • broader era spans 13 B'aktun, or about 5,200 years.
Mars Base

Meteorite From California Fireball Is Meteor-wrong, Scientist Says | Space.com - 0 views

www.space.com/all-meteorite-normal-rock.html

scibyte69 meteor

shared by Mars Base on 26 Oct 12 - No Cached
  • A rock thought to be a meteorite from a recent fireball seen over Northern California is in fact, just a regular Earth rock
  • Projected band (light area) where meteorites of different size may have fallen over Marin and Sonoma counties from an Oct. 17, 2012 meteor.
  • Novato, Calif. resident
  • ...6 more annotations...
  • read about the fireball and recalled hearing a sound on her roof that night
  • she and neighbors found a ding on the roof
  • On closer inspection, that crust was a product of weathering of a natural rock, not from the heat of entry
  • Examination of the rock under a petrographic microscope quickly revealed the stone was not a meteorite
  • the ding on Webber's roof, along with her recollection of the sound she heard that night, suggest her house may in fact have been hit by a still-missing meteorite.
  • r Marin and Sonoma counties
Mars Base

Ancient Quasar Shines Brightly, But All the Galaxy's Stars Are Missing - 0 views

www.universetoday.com/...-the-galaxys-stars-are-missing

scibyte69 quasar

shared by Mars Base on 24 Oct 12 - No Cached
  • Quasars have been the best and most easily observed beacons for astronomers to probe the distant Universe
  • one of the most distant and brightest quasars is providing a bit of a surprise
  • Astronomers studying a distant galaxy, dubbed J1148+5251 and which contains a bright quasar, are seeing only the quasar and not the host galaxy itself
  • ...15 more annotations...
  • has been thought that the quasar has been feeding on a handful of stars every year in order to bulk up to its size of three billion solar masses over just a few hundred million years. But where are all the stars
  • Near infrared views with the Hubble Space Telescope’s Wide Field Camera 3 are only providing hints of what might be taking place
  • galaxy is so enshrouded with dust that none of the starlight can be seen
  • only the bright, blaring quasar shines through
  • most early galaxies contain hardly any dust
  • the early universe was dust-free until the first generation of stars started making dust through nuclear fusion
  • quasar was first identified in the Sloan Digital Sky Survey (SDSS) and the follow-up submillimeter observations showed significant dust but not how and where
  • If you want to hide the stars with dust
  • make lots of short-lived massive stars earlier on that lose their mass at the end of their lifetime
  • used Hubble to very carefully subtract light from the quasar image and look for the glow of surrounding stars.
  • remarkable
  • Hubble didn’t find any of the underlying galaxy
  • Because we don’t see the stars, we can rule out that the galaxy that hosts this quasar is a normal galaxy
  • It’s among the dustiest galaxies in the universe
  • so widely distributed that not even a single clump of stars is peeking through
Mars Base

Soyuz Launches New Crew to Space Station - 0 views

www.universetoday.com/...ches-new-crew-to-space-station

scibyte69

shared by Mars Base on 24 Oct 12 - No Cached
Mars Base

Zoom Through 84 Million Stars in Gigantic New 9-Gigapixel Image - 0 views

www.universetoday.com/...gigantic-new-9-gigapixel-image

scibyte69 media

shared by Mars Base on 24 Oct 12 - No Cached
  • new gigantic nine-gigapixel image from the VISTA infrared survey telescope at ESO’s Paranal Observatory of the central portion of the Milky Way Galaxy
  • resolution of this image is so great, that if it was printed out in the resolution of a typical book, it would be 9 meters long and 7 meters tall
  • The huge dataset contains more than ten times more stars than previous studies
  • ...4 more annotations...
  • By observing
  • we can learn a lot more about the formation and evolution of not only our galaxy, but also spiral galaxies in general
  • To help analyze this huge catalogue, the brightness of each star is plotted against its color for about 84 million stars to create a color–magnitude diagram
  • plot contains more than ten times more stars than any previous study
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