photo source |
- Bicycles: >500,000,000
- Cyclists: >37.2%
photo source |
photo source |
photo source |
photo source |
- Bicycles: 3,250,000
- Cyclists: ~60.4%
photo source |
photo source |
photo source |
photo source |
photo source |
photo source |
photo source |
photo source |
photo source |
photo source |
photo source |
photo source |
photo source |
photo source |
photo source |
Arp 273 Credit: NASA, ESA, A. Riess (STScI/JHU), L. Macri (Texas A&M University), and Hubble Heritage Team (STScI/AURA) |
The Bosnian Pyramid of the Sun (Visocica Hill), is the first European pyramid to be discovered and is located in the heart of Bosnia, in the town of Visoko. The pyramid has all the elements: four perfectly shaped slopes pointing toward the cardinal points, a flat top and an entrance complex. On top of the pyramid are also the ruins of a Medieval walled town, once the base of a Bosnian king Tvrtko of Kotromanic (1338-1391).
Numerous scientific analysis suggest artificiality of the monument: satellite imagery, thermal inertia analysis that shows quick heat loss due to inner chambers and hallways; penetrating radar suggests straight passageways with 90 degrees intersections; water drainage and inner angles of 45 degrees characteristic for artificial objects. Geo-archaeological research uncovered man-made stone blocks that the pyramid walls.
Between 27,000 and 12,000 years ago, the Balkans were locked in the last Glacial maximum, a period of very cold and dry climate with glaciers in some of the mountain ranges. The only occupants were Upper Paleolithic hunters and gatherers who left behind open-air camp sites and traces of occupation in caves. These remains consist of simple stone tools, hearths, and remains of animals and plants that were consumed for food. These people did not have the tools or skills to engage in the construction of monumental architecture.
Released in December, the image is among a series of new views snapped by MRO's HiRISE camera that show intriguing geological features on Mars. Each image covers a strip of Martian ground 3.7 miles (6 kilometers) wide and can reveal a detail about as small as a desk—and so far no sign of Star Wars monsters.
A sharp close-up of the the larger Martian pit revealed sediment and boulders (seen in a picture taken in fall 2010 by the Mars Reconnaissance Orbiter's HiRISE camera), as well as hints of sand that was blown inside and trapped in the deepest and darkest parts of the hole, according to NASA.
Car-size boulders punctuate the bottom of the smaller Martian pit (pictured in a fall 2010 HiRISE image). A bright sand dune laced with windblown ripples covers the sloping western side of the hole.
The two pits are believed to be relatively young, according to NASA. As the pits age, the slopes become shallow and widen as they material at the edges collapses inward.
Among other recently released pictures from NASA's Mars Reconnaisance Orbiter are these images of apparent mud volcanoes on in Acidalia Planitia, a large basin in Mars's northern lowlands (seen in a fall 2010 HiRISE picture).
Mud volcanoes—which also exist on Earth—form when wet, pressurized sediment buried at depth erupts onto the surface. (Related photo: "'Medusa' Worms Found in Mud Volcano.")
A gigantic trough (center) slices through Mars's Tharsis volcanic region in a fall 2010 picture by HiRISE.
Called a graben, the 1.2-mile-wide (2-kilometer-wide) depression formed when a block of the planet's crust dropped down between two faults. In this case, the tectonic movement left nearly vertical walls—each about a kilometer (0.6 mile) deep—on either side.
"From the scarcity of craters inside the graben, it's estimated to be less than a billion years old," principal investigator McEwen said. "This one is nicely defined because it cuts a well-preserved lava flow."
An unidentified employee of the Stefanik Observatory in Prague uses a projection shield to show the partial solar eclipse visible in the Czech capital during the morning on Tuesday, Jan. 4, 2011. The partial Sun eclipse started over the Czech Republic at about 08:00 CET and it will last until 10:50. In the culminating phase, up to 80 percent of the solar disc was obscured by the silhouette of the Moon passing between it and the Earth.
(AP Photo/CTK, Michal Kamaryt)
Personally, the video looks no different than anyother video footage I have ever seen. So, you be the judge. Is this UK UFO sighting just another hoax?
Planet discovered that can sustain life as we know it. That really sounds great and I would love to let out a big “HOORAY!” and all, but of course there is a catch…IT’S 20 LIGHT YEARS AWAY!!!
Alan Boyle writes: Astronomers say they've found the first planet beyond our solar system that could have the right size and setting to sustain life as we know it, only 20 light-years from Earth.
"My own personal feeling is that the chances of life on this planet are 100 percent," Steven Vogt, an astrophysicist at the University of California at Santa Cruz, told reporters today. "I have almost no doubt about it."
The discovery, published online in The Astrophysical Journal, is the result of 11 years of observations at the Keck Observatory in Hawaii. Astronomers participating in the Lick-Carnegie Exoplanet Survey detected the planet by tracking the faint gravitational wobbles it produced in its parent star. Now they say there may well be many more planets out there like this one.
"The fact that we were able to detect this planet so quickly and so nearby tells us that planets like this must be really common," Vogt said in a news release.
One of Vogt's co-authors, Paul Butler of the Carnegie Institution, reminded reporters during a teleconference today that the first exoplanet orbiting a normal star was detected 15 years ago. Since then, almost 500 other alien planets have been found. "We're at exactly that threshold now with finding habitable planets," Butler said.
The newfound planet, known as Gliese 581g, is estimated to be 3.1 to 4.3 times as massive as Earth, and makes a complete circuit around its sun in just under 37 days. If the planet has a rocky composition like Earth's, it would be 1.2 to 1.4 times as wide as our own planet, qualifying it as a "super-Earth."
Even more intriguingly, the red dwarf star's dimness and the planet's orbital distance (0.146 AU, less than half the distance between Mercury and our sun) suggest that the planet's average surface temperature is not that far below water's freezing point (somewhere between 10 and -24 degrees Fahrenheit, or -12 and -31 degrees Celsius).
Although that average may sound chilly, the astronomers say Gliese 581g appears to be tidally locked to its star, with one side perpetually in the sun and the other side perpetually dark. That means the highs on the day side would be hellishly hot. The lows on the night side would be unendurably cold. But there would be a livable zone along the line between shadow and light.
"Any emerging life forms would have a wide range of stable climates to choose from and to evolve around, depending on their longitude," Vogt said.
Based on this analysis, Vogt and his colleagues say Gliese 581g is in a planetary zone that is, in the words of the Goldilocks tale, "not too hot and not too cold, but just right" for water to exist somewhere in liquid form. Astrobiologists say that life seems to exist anyplace on Earth that has liquid water, and that such a Goldilocks zone should be conducive to alien life as well. Some astronomers have even proposed that super-Earths could be friendlier to life than our own home world.
The Gliese 581 system is already well-known to planet hunters. Gliese 581g is the sixth planet to be detected around the parent star. Two other planets in the system are on the edges of the Goldilocks zone: Gliese 581c (potentially "too hot") and Gliese 581d (potentially "too cold"). "Now we have one in the middle that's just right," Vogt said.
The method that was used to detect the latest member of Gliese 581's planetary family, known as radial velocity, requires painstaking observations over a number of years. As the method is currently practiced, it's not capable of finding Earthlike planets around sunlike stars. The Lick-Carnegie Exoplanet Survey was able to spot this super-Earth because it could exert a relatively large pull on a relatively small star. But the observations weren't easy: It took 238 measurements, conducted over 11 years with the aid of the European-led HARPS team, to confirm Gliese 581g's existence.
Astronomers believe it will be easier in the future to find habitable planets — not only because they're building up a larger database of radial velocity measurements, but also because new space probes such as NASA's Kepler and Europe's CoRoT satellite are detecting hundreds of exoplanets using a different technique known as the transit method.
"The number of systems with potentially habitable planets is probably on the order of 10 or 20 percent, and when you multiply that by the hundreds of billions of stars in the Milky Way, that's a large number," Vogt said. "There could be tens of billions of these systems in our galaxy."
But how accessible would they be? Relatively speaking, Gliese 581g is in our celestial neighborhood, but it would take tens of thousands of years to get there using conventional rocket technologies. Vogt said it might be possible to send a robotic probe to the planet using an experimental nuclear propulsion system, such as the Project Orion system that was proposed a half-century ago but never built.
"If you're traveling at a tenth of the speed of light, you could reach this thing in 200 years," Vogt told reporters, "Now, you probably wouldn't send humans there, because that would be multiple generations and you'd need a big crew cabin and there wouldn't be much to do for 200 years. But you could send sophisticated robot cameras. Basically, the equivalent of a Droid cell phone would do pretty well. ... In 220 years, if we started now, you would be able to get close-up pictures and a sense of what kind of atmosphere was there, and radio communications, that sort of thing. And it would be a great thing to do with the world's stockpile of nuclear weapons. Just put 'em up on a rocket and send 'em up there."
More on alien planets: