Zobrazují se příspěvky se štítkemNASA. Zobrazit všechny příspěvky
Zobrazují se příspěvky se štítkemNASA. Zobrazit všechny příspěvky

středa 29. května 2013

Lizard on Mars! Or is it just a rock plus wild imagination again? (ufosightingsdaily)



A science blogger with a keen sense of vision claims to have spotted a lizard meandering around Mars. 

The unknown spotter is from Japan and alerted the website, UFO Sightings Daily, of the unusual sight. 

The rather unbelievable and completely unsubstantiated claim has caused some excitable conspiracy theorists to fear that the NASA could be planting life on the planet for scientific testing.

The creature, judged to be either a rat or lizard, appeared in photos that were released by the American space agency in March. 

The photos were captured by a camera on NASA's Curiosity Rover.

pátek 24. května 2013

Unpack a Meal of Astronaut Space Food (Smithsonian Magazine)


Surely I’m not the only one whose primary memory of childhood trips to Washington, D.C. focuses less on my exposure to the splendid pageant of democracy, or soaking in the accumulated treasure of America’s cultural history but, rather, on a 3- by 3-inch foil-wrapped block of something called astronaut ice cream. This was before freeze-dried ice cream had become standard museum gift-shop fare—obviously way before the advent of www.astronauticecreamshop.com. The highlight of a weekend in the nation’s capital was unwrapping that weirdly light packet, revealing the tricolored brick within. It had the consistency of Styrofoam and left a strange, slick film on the back of your teeth; even at that age, if pressed, I would have had to admit that regular, frozen Earth ice cream was in every way superior. But astronaut ice cream came with the ultimate value-added, better than hot fudge or peanuts: I was eating what astronauts ate!
As it turns out, I wasn’t. Or, rather, I was eating what only very few astronauts ever ate (unless, of course, they too grew up visiting the museum gift shop). Freeze-dried ice cream did make an appearance on the Apollo 7 mission, in 1968, but was scratched from the space program soon after. The astronauts, it seems, didn’t like the stuff. The good news is that, as the Smithsonian’s collection amply demonstrates, the history of feeding men and women in space is plenty fascinating without it.
The first thing you have to realize about space, says Jennifer Levasseur, who curates the some-485 items of space food at the National Air and Space Museum, is that it changes everything about what you can and cannot eat. Knives, for instance, pose a hazard; an accidental puncture of equipment could be catastrophic. In the highly flammable, oxygen-rich environment of a space ship, no packaging or utensils can run the risk of creating a spark. Famously, a corned-beef sandwich was smuggled aboard Gemini 3 by pilot John W. Young. This may have been seen as a triumph for devotees of delicatessen, but it was seriously frowned upon by the NASA powers that be.
Like a kid’s lunchbox at the end of the school day, the collection Levasseur administers is in some ways a barometer of failed foods. That is, leftovers—freeze-dried packets returned to Earth, unopened and summarily rejected. (Three signature NASM examples are on offer here : beef-barbecue cubes, fruitcake and coffee with cream—unused from Neil Armstrong’s meal allotments, avoided during the Apollo 11 mission to the Moon he commanded in 1969.) “We have a lot of instant breakfasts,” she says. “I get the feeling these were the kinds of guys who just woke up and drank coffee.” Foods transformed into totally unrecognizable forms also fared poorly—which may explain the failure of astronaut ice cream. “There was a ‘bacon bar’ that looks something like a granola bar,” adds Levasseur. “We have quite a lot of those.”

pátek 19. dubna 2013

NASA has discovered the most Earth-like planets yet (io9.com)


"NASA's Kepler mission has discovered a trio of distant planets that look remarkably like our own. Belonging to solar systems located 1,200 and 2,700 light years from Earth, the three Earth-sized worlds have been spotted orbiting in the so-called Goldilocks Zone of their parent stars – the "just-right" range at which liquid water, and life, can exist on a planet's surface. 

NASA's Kepler mission has been hunting for worlds beyond our solar system for a little over four years now, and it's been enormously successful. In that time, it's spotted literally thousands of planetary candidates. Today, three distant worlds –dubbed Kepler-62f, Kepler-62e, and Kepler-69c –have achieved planetary confirmation, while joining an elite cadre of so-called habitable planets. 

Kepler-62f (an artist's depiction of which appears above) and 62e possess radii just 1.4- and 1.6-times that of Earth's, respectively, and orbit a star some 1,200 light years away, along with three other newly discovered planets. Kepler-69c, on the other hand, has a radius 1.7-times that of Earth, and orbits a star around 2,700 light years distant from our own. Together, the three newly discovered worlds have become the second,third, and fourth known bodies to wear the badge of "Earth-like, habitable zone planet."

pátek 29. března 2013

This is a picture of the lightest substance on Earth (io9)


"Scientists have just unveiled the lightest human-made substance on Earth. How light are we talking? Let's put it this way: it's less dense than helium.

The battle for rights to the title of world's lightest material (technically world's lowest density material) has played out like a brutally rapid series of monarchal overthrows. For years, NASA's aerogel (density 1 milligram per cubic centimeter) held the title of lightest material on Earth. In November 2011, it was dethroned by a gorgeous, ultralight metallic microlattice (density 0.9 mg/cm3). Months later, a substance called "Aerographite" with a density of just 0.2 mg/cm3 blew both of these ultralight materials out of the water. Now, a new material has assumed the throne."

more - here (io9.com)