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Mars Base

New look at HD 10180 shows it might have nine planets - 0 views

phys.org/...2012-04-hd-planets.html

scibyte42 exoplanet

shared by Mars Base on 09 Apr 12 - No Cached
  • after looking at data regarding the solar system surrounding the star HD 10180, that it likely has nine planets making it the most highly populated solar system known to man
  • after studying slight wobbles by the star as it’s tugged by planetary gravitation, he found what he believes is confirmation of a seventh planet, and evidence for two more
  • HD 10180 is about 130 light years away from us
  • ...17 more annotations...
  • first noted by astronomers in 2010
  • it was thought the solar system consisted of just five planets
  • speculation that it might have as many as seven
  • other work has shown that there are likely six planets, five of which are believed to have a mass close to that of Neptune
  • other appears closer in mass to Saturn
  • to these conclusions by studying the way a star appears to wobble (a Doppler shift
  • studying these light shifts, astronomers can deduce not only the size of the planet that causes it, but its period as well
  • didn’t make any new observations
  • he went back and looked at the original data using different kinds of statistical analysis techniques
  • found evidence for three more planets, all much smaller than the original six
  • estimates to be 1.3, 1.9, and 5.1 times the size of Earth
  • much shorter periods (1.2, 10 and 68 days) than
  • they are very close to their star, closer even than Mercury is to our sun
  • far too hot to support water retention or life, at least as we know it.
  • doesn’t actually prove that any of the planets suspected of revolving around HD 10180 actually exist
  • merely offers strong evidence
  • statistical evidence offered by Tuomi suggesting that if there are truly planets there, they all appear to have stable orbits.
Mars Base

Help Track the Effects of Light Pollution with GLOBE at Night - 0 views

www.universetoday.com/...-pollution-with-globe-at-night

scibyte42 LightPollution

shared by Mars Base on 12 Apr 12 - No Cached
  • GLOBE at Night is a citizen-science project to raise awareness of the impact of light pollution by inviting citizen-scientists to make naked-eye observations of the night sky in your area.
  • Participating in GLOBE at Night requires only five easy steps
  • Find your latitude and longitude
  • ...6 more annotations...
  • Find Orion, Leo or Crux by going outside more than an hour after sunset (about 8-10pm local time).
  • Match your nighttime sky to one of the provided magnitude charts.
  • Report your observation.
  • Compare your observation to thousands around the world
  • You can also use the new web application data submission process
  • People in 115 countries have contributed over 75,000 measurements during the past six years
Mars Base

Sub Glacial Lakes | Jupiter Broadcasting - 0 views

www.jupiterbroadcasting.com/...acial-lakes-updates-scibyte-33

scibyte42 Europa Alzheimer

shared by Mars Base on 12 Apr 12 - No Cached
Mars Base

Habitable Planets & Chimps | Jupiter Broadcasting - 0 views

www.jupiterbroadcasting.com/...able-planets-chimps-scibyte-24

scibyte42 Alzheimer

shared by Mars Base on 12 Apr 12 - No Cached
  • Habitable Planets & Chimps | SciByte 24
  • December 7, 2011
  • Alzheimer’s Research
Mars Base

Baby Mammoths & Feathered Dinosaurs | SciByte | Jupiter Broadcasting - 0 views

www.jupiterbroadcasting.com/...feathered-dinosaurs-scibyte-41

scibyte42 dinosaur

shared by Mars Base on 12 Apr 12 - No Cached
  • Baby Mammoths & Feathered Dinosaurs | SciByte 41
  • April 10, 2012
  • More Fine Feathered Dinosaurs
Mars Base

Curiosity Rover | SciByte | Jupiter Broadcasting - 0 views

www.jupiterbroadcasting.com/...curiosity-rover-scibyte-21

scibyte42 Europa

shared by Mars Base on 12 Apr 12 - No Cached
  • Curiosity Rover | SciByte 22
  • November 22, 2011
  • Jupiter’s ice-moon Europa
Mars Base

Higgs Bosons & Tough Materials | Jupiter Broadcasting - 0 views

www.jupiterbroadcasting.com/...higgs-bosons-tough-materials

scibyte42 dinosaur

shared by Mars Base on 12 Apr 12 - No Cached
  • Higgs Bosons & Tough Materials | SciByte 25
  • December 13, 2011
  • The North American “terrible (large) lizard”
Mars Base

Feedback & Space Lego's | Jupiter Broadcasting - 0 views

www.jupiterbroadcasting.com/...eedback-space-legos-scibyte-31

scibyte42 dinosaur

shared by Mars Base on 12 Apr 12 - No Cached
  • Feedback & Space Lego’s | SciByte 31
  • January 31, 2012
  • Dinosaur feather colors
Mars Base

Moons Here & There | Jupiter Broadcasting - 0 views

www.jupiterbroadcasting.com/...moons-here-there-scibyte-28

scibyte42 exoplanet

shared by Mars Base on 12 Apr 12 - No Cached
  • Moons Here & There | SciByte 28
  • January 10, 2012
  • The Exoplanet and Exomoon News keeps coming
Mars Base

Habitable Planets & Plant Power | Jupiter Broadcasting - 0 views

www.jupiterbroadcasting.com/...planets-plant-power-scibyte-32

scibyte42 exoplanet

shared by Mars Base on 12 Apr 12 - No Cached
  • Habitable Planets & Plant Power | SciByte 32
  • February 7, 2012
  • Habitable planet?
Mars Base

Exoplanets & Social Media | Jupiter Broadcasting - 0 views

www.jupiterbroadcasting.com/...lanets-social-media-scibyte-29

scibyte42 exoplanet

shared by Mars Base on 12 Apr 12 - No Cached
  • Exoplanets & Social Media | SciByte 29
  • January 17, 2012
  • The exoplanets never stop coming
Mars Base

Planets & Brains | Jupiter Broadcasting - 0 views

www.jupiterbroadcasting.com/...planets-brains-scibyte-18

scibyte42 exoplanet

shared by Mars Base on 12 Apr 12 - No Cached
  • October 25, 2011
  • Baby pictures of a Planet
Mars Base

Scientists find possible cause of movement defects in spinal muscular atrophy - 0 views

medicalxpress.com/...t-defects-spinal-muscular.html

scibyte42 medical SpinalMuscularAtrophy

shared by Mars Base on 11 Apr 12 - No Cached
  • abnormally low level of a protein in certain nerve cells is linked to movement problems that characterize the deadly childhood disorder spinal muscular atrophy, new research in animals suggests
  • previous research has established the disease’s genetic link to SMN in motor neurons, scientists haven’t yet uncovered how this lack of SMN does so much damage
  • showed in zebrafish that when SMN is missing – in cells throughout the body as well as in motor neurons specifically – levels of a protein called plastin 3 also decrease
  • ...15 more annotations...
  • When the researchers added plastin 3 back to motor neurons in zebrafish that were genetically altered so they couldn’t produce SMN, the zebrafish regained most of their swimming abilities movement that had been severely limited by their reduced SMN. These findings tied the presence of plastin 3 – alone, without SMN – to the recovery of lost movement
  • without SMN in their cells still eventually died, so the addition of plastin 3 alone is not a therapeutic option
  • using animal studies to pinpoint the role of plastin 3 in this disease
  • In zebrafish genetically altered so they don’t produce SMN, plastin 3 levels remained low, as well.
  • lowering plastin 3 first in the fish – SMN was unaffected. This showed that the plastin 3 decrease occurred only when SMN was lowered first
  • SMN production was stimulated in zebrafish initially lacking the protein, plastin 3 levels were restored as well
  • researchers determined that decreased SMN influences plastin 3 production at a late point in the process called translation, when amino acids are strung together to form the protein’s initial shape
  • lack of SMN creates conditions in which too little plastin 3 is made to complete the protein’s normal functions – in these animals, the reduction was about four-fold
  • maybe SMN is affecting translation of other proteins that could be contributing to spinal muscular atrophy
  • That hasn’t been shown before
  • examination of zebrafish motor neurons suggested that decreased plastin 3 affects these cells in at least two ways
  • damaging axons, branch-like extensions that allow for communication among nerve cells
  • destabilizing synapses, structures through which those signals pass
  • result of the added plastin 3, the fish recovered their ability to turn and swim, movements they were previously unable to make.
  • rescued axons, synaptic proteins and behavior all by putting plastin 3 back in motor neurons,” she said. “That’s very encouraging.”
Mars Base

Eggs of enigmatic dinosaur discovered - 0 views

phys.org/...4-eggs-enigmatic-dinosaur.html

scibyte42 dinosaur

shared by Mars Base on 11 Apr 12 - No Cached
  • reported a 70 million years old pocket of fossilized bones and unique eggs of an enigmatic birdlike dinosaur in Patagonia.
  • unique are the two eggs preserved near articulated bones of its hindlimb. This is the first time the eggs are found in a close proximity to skeletal remains of an alvarezsaurid dinosaur
  • The dinosaur represents the latest survivor of its kind from Gondwana, the southern landmass in the Mesozoic Era
  • ...8 more annotations...
  • belongs to one of the most mysterious groups of dinosaurs, the Alvarezsauridae, and it is one of the largest members, 2.6 m, of the family
  • The two eggs found together with the bones during the expedition might have been inside the oviducts of the Bonapartenykus female when the animal perished
  • numerous eggshell fragments later found show considerable calcite resorption of the inner eggshell layer
  • suggest that at least some of the eggs were incubated and contained embryos at an advanced stage of their development.
  • analyzed the eggshells and found that it did not belong to any known category of the eggshell microstructure-based taxonomy
  • a new egg-family, the Arraigadoolithidae
  • using the electron scanning microscopy I observed unusual fossilized objects inside of the pneumatic canal of the eggshells
  • the first evidence of fungal contamination of dinosaur eggs
Mars Base

Land Bridge Caused Wild Temperature Swings - ScienceNOW - 0 views

news.sciencemag.org/...e-caused-wild-temperature.html

scibyte42 BeringStrait

shared by Mars Base on 11 Apr 12 - No Cached
  • When the Bering Strait (box, lower left) was closed at the height of the last ice age, any sudden influx of fresh water to the North Atlantic couldn't flow through the Arctic Ocean to the North Pacific, making episodes of abrupt climate change much more likely.
  • Much of the last ice age was characterized by violent climate swings
  • beginning about 80,000 years ago, average temperatures in and around the North Atlantic rose or fell by 10°C or more in the course of a decade or two—a pattern that lasted for 70,000 years
  • ...24 more annotations...
  • a new study also points to a more earthbound culprit: the presence of a land bridge connecting Asia to North America.
  • debated whether the climate swings were driven by sharp variations in solar activity or simply by unstable climatic processes
  • Earth's climate has been relatively stable since the end of the last ice age
  • temperatures were fairly stable, too, after the ice age began in earnest about 100,000 years ago
  • 20,000 years later, things became unhinged
  • global sea level dropped to about 50 meters lower than it is today
  • As the ice sheets that covered North America and northern Eurasia snatched up more and more of Earth's water
  • exposed a broad strip of land that connected what is today Alaska and Siberia
  • Ancient animals used the land bridge, which measured as much as 1500 kilometers wide in spots, to roam back and forth between Asia and North America
  • also huge consequences for Earth's climate
  • two sets of climate simulations
  • one in which the Bering Strait was open
  • one in which it was blocked
  • each set of simulations, the researchers gradually added large amounts of fresh water to the North Atlantic between the latitudes of 20° and 50
  • researchers propose, this swath, which spans the latitudes from southern Cuba to southern England, would have received large amounts of meltwater from Northern Hemisphere ice sheets during warm spells that occasionally punctuated the ice age
  • Today, the surface waters in this swath affect the temperature and salinity of water even farther north in the Atlantic
  • a region where surface waters cool, sink to the seafloor, and then flow southward—a critical link of the worldwide conveyor belt of ocean circulatio
  • Gulf Stream, which brings climate-warming waters from the equator to the North Atlantic, comes to a halt.
  • If waters of the far North Atlantic don't sink, says Hu, much of the large-scale ocean circulation worldwide temporarily collapses
  • surface waters became so fresh that they never got denser than the underlying salty water, and therefore never sank
  • shutting down ocean circulation and plunging areas around the North Atlantic, including Greenland, into a cold spell
  • researchers noted a critical difference between the sets of simulations: When the Bering Strait was closed, it took as many as 1400 years for ocean circulation to recover; when the strait was open, the circulation rarely took more than 400 years to recuperate
  • sign that ocean circulation is stable when the strait is open
  • Whenever the ocean circulation shut down in the simulations, temperatures in Greenland suddenly dropped by 12°C—a decrease similar in magnitude to many abrupt cold snaps chronicled in the Greenland ice core records
Mars Base

Bering Strait may be global temperature stabilizer - 0 views

phys.org/...al-temperature-stabilizer.html

scibyte42 BeringStrait

shared by Mars Base on 11 Apr 12 - No Cached
  • normally the AMOC causes cycling of warm water from the south to flow north, and cold water from the north to flow south
  • engine for this system is cold salt laden water in the north sinking beneath incoming warm water
  • If the cold water in the north is fresh, as it would be if it were coming from the melted glaciers, then it wouldn’t sink and the whole AMOC system would stop
  • ...2 more annotations...
  • if it stopped, air temperatures could change quickly.
  • computer simulation actually showed the same temperature fluctuations over Greenland as researchers have found, via core ice samples, occurred the last time the Strait closed during the last Ice Age.
Mars Base

U.S. FDA Approves Possible Alzheimer's Test - ScienceInsider - 0 views

news.sciencemag.org/...roves-possible-alzheimers.html

scibyte42 Alzheimer

shared by Mars Base on 12 Apr 12 - No Cached
  • the U.S. Food and Drug Administration (FDA) approved a radioactive compound for evaluating people with cognitive impairment for Alzheimer's disease
  • Amyvid, binds to amyloid plaques, the calling card of Alzheimer's disease in the brain
  • before a PET scan, Amyvid allows doctors to see whether amyloid has begun to build up
  • ...6 more annotations...
  • negative test reduces the likelihood
  • a positive test does not necessarily confirm
  • concerns: that it could be overused in general
  • and there will be
  • both false positives and false negatives
  • medical community is going to have to develop its own standards
Mars Base

Solar Storms & Higgs Boson | Jupiter Broadcasting - 0 views

www.jupiterbroadcasting.com/...-storms-higgs-boson-scibyte-37

scibyte39 moon MarMedia apollo scibyte42 dinosaur

shared by Mars Base on 22 Mar 12 - No Cached
  • Solar Storms & Higgs Boson | SciByte 37
  • March 13, 2012
  • More Dinosaur feathers get color
Mars Base

The Night Sky Guide for April 2012 | meteorwatch.org - 0 views

www.meteorwatch.org/...night-sky-guide-for-april-2012

scibyte41 LookingUp scibyte42 scibyte43

shared by Mars Base on 02 Apr 12 - No Cached
  • The Lyrid meteor shower will be best seen in the early morning hours of April 22nd. Under a dark sky, you can expect to see up to 20 bright meteors per hour.
  • Evening Planets
  • In early April, four planets grace the sky at nightfall
  • ...6 more annotations...
  • In the west, Jupiter hangs low on the horizon. Around mid-month, the planet disappears into the sunset
  • Venus blazes just above Jupiter in the west. Use a telescope to see its crescent phase.
  • In the south, Mars is already climbing high. It will remain visible into the early morning
  • Saturn will shine low in the east in the evening but climb higher during the night. On April 15th, Saturn reaches opposition, meaning it is opposite the Sun in Earth’s sky. It is also closer to Earth than it’ll be the rest of the year, making it appear slightly bigger and brighter
  • Constellations and Deep-Sky Objects
    • Mars Base
      Mars Base on 11 Apr 12
       
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