27 junho 2015
Stars of a Summer Triangle
Rising at the start of a northern summer's night, these three bright stars form the familiar asterism known as the Summer Triangle. Altair, Deneb, and Vega are the alpha stars of their respective constellations, Aquila, Cygnus, and Lyra, nestled near the Milky Way. Close in apparent brightness the three do look similar in these telescopic portraits, but all have their own stellar stories. Their similar appearance hides the fact that the Summer Triangle stars actually span a large range in intrinsic luminosity and distance. A main sequence dwarf star, Altair is some 10 times brighter than the Sun and 17 light-years away, while Vega, also a hydrogen-fusing dwarf, is around 30 times brighter than the Sun and lies 25 light-years away. Supergiant Deneb, at about 54,000 times the solar luminosity, lies some 1,400 light-years distant. Of course, with a whitish blue hue, the stars of the Summer Triangle are all hotter than the Sun.
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plannedparenthood: It’s National HIV Testing Day! Getting...
It’s National HIV Testing Day!
Getting tested is a basic part of being healthy — and it’s quick, easy, and painless. The sooner you know your status, the sooner you can get treatment.
rosalarian: veggieheather:wertheyouth:Infographic: Legally...
Infographic: Legally Married and Legally Fired, Center for American Progress
THIS THIS THIS
I’m continuously terrified that people will think LGBT rights is a finished fight as soon as marriage equality passes nationally. There’s still so much extremely important stuff to get to. Marriage is not an end goal.
today: earth, photographed by terra & aqua, 27th june...
today: earth, photographed by terra & aqua, 27th june 2015.
arctic canada, 01:15utc.
pacific ocean off peru, 19:25 utc.
coast of chile, 15:00 utc.
south pacific, 18:25 utc.
image credit: nasa/modis.
consciousness-arose: ageofdestruction: today: the earth,...
today: the earth, photographed by terra & aqua, 26th june 2015.
00:30 utc: arctic ocean off the coast of greenland.
00:50 utc: bering sea & north pacific ocean.
05:25 utc: western australia.
09:20 utc: south atlantic ocean and the coast of namibia.image credit: nasa/modis.
wow! where can I find this??
the modis rapid response page! these are all crops of orbit swath images, which show up online about 90 minutes after they’re taken.
a more viewer-friendly interface is the worldview browser, where you can see the same imagery stitched into a global map; images arrive about another 90 minutes later.
hope this helps!
b.
age
Memorial Day in 1945. Dutch soldiers honor the graves of...
Memorial Day in 1945. Dutch soldiers honor the graves of American soldiers who gave their lives to liberate the Netherlands from the Nazis.
ucsdhealthsciences: Threading the NeedleWhen news broke earlier...
Threading the Needle
When news broke earlier this year of an HIV outbreak in rural Indiana, it stunned many. The Midwestern state seemed an unlikely hotspot, a far cry – figuratively and literally – from places much more associated with the disease.
Among HIV researchers, however, it was not a surprise; the warning signs had been there, multiplying with viral efficiency. In a Perspectives essay published in the New England Journal of Medicine, authors Steffanie A. Strathdee, PhD, associate dean of global health sciences, and Chris Beyrer, MD, at Johns Hopkins Bloomberg School of Public Health, describe the sequence of events and behaviors that led to the outbreak and how it (and similar events) can be stopped.
There are reports that the HIV outbreak in Indiana may be peaking. That’s good news. Better news, write Strathdee and Beyrer, would be taking measures to avoid such outbreaks in the first place.
Pictured: A scanning electron micrograph of a hypodermic needle point containing red blood cells. Courtesy of Gise Tileria Palacios.
Sally Ride wasn’t just the first American woman, but also...
Sally Ride wasn’t just the first American woman, but also the first confirmed lgbtq astronaut, of any nation, to go to space.
Three students from England’s Isaac Newton Academy won top...
Three students from England’s Isaac Newton Academy won top honors in the TeenTech Awards for their color-changing condoms concept, called S.T. EYE. (TeenTech Awards)
Teens think up clever condoms that would change colors to indicate STD exposure
“This is one #aftersex glow that you probably don’t want,” quipped MTV News’s Tess Barker.
Just imagine it: You’re in the, um, moment and — like a sexually responsible person — you put on a condom. But at some point, it starts to glow and change colors on you — an indication that you’ve just come in contact with a sexually transmitted disease or sexually transmitted infection.
Naturally, it would take three teenage boys to think it up. Students fromEngland’s Isaac Newton Academy have created a concept for a smart condom that would alter its luminescent hue when exposed to common STDs. There would be antibodies on the condom that would interact with the antigens of STDs, causing the condom to change colors depending on the disease.
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