Another record-breaking canyon may exist under the ice of the south polar continent, carved by water.It’s a thousand kilometers long, compared to the Grand Canyon’s 433. It’s a kilometer deep, comparable to the Grand Canyon. So far, it has been detected from surface depressions and ice-penetrating radar. If confirmed, it could be called “World’s largest canyon … hidden under [the] Antarctic ice sheet” (Science Daily). The main canyon is part of a canyon system including five or more parallel canyons, as seen in a diagram on the BBC News. Science Daily says,Although the discovery needs to be confirmed by direct measurements, the previously unknown canyon system is thought to be over 1,000km long and in places as much as 1km deep, comparable in depth to the Grand Canyon in USA, but many times longer.How did these canyons form? There are two theories. One would require believing the south pole was much warmer long ago.The researchers believe that the landscape beneath the ice sheet has probably been carved out by water and is either so ancient that it was there before the ice sheet grew or it was created by water flowing and eroding beneath the ice.Live Science only mentions the latter hypothesis, that it formed from flowing water under the ice. It would seem a heavy overburden of ice would inhibit transport of large quantities of sediments out the mouth of a flowing river, but this was not mentioned; it may be too early to tell.Interestingly, a similar canyon was found in 2013 under the Greenland ice (8/29/13), almost twice as long as the Grand Canyon but half as deep. Years before, fossil DNA found 2km under the ice showed that the land once sported pine trees, butterflies, beetles and other temperate life (7/06/07). And in 2004, remnants of pine needles, bark and grass were found at the bottom of an ice core 10,400 feet long, two miles below the icy surface (8/16/04). A scientist then commented that the Greenland ice sheet “formed very fast.” In that case, scientists believed the canyon formed before the ice sheet covered the land.Experts from Durham University remarked that the surface of Mars is better understood than the bed of Antarctica here on our own planet.What extreme geological and atmospheric conditions could carve a super-Grand Canyon under Antarctica or Greenland? Perhaps a global flood of hot water coming out of the mid-oceanic ridge could do it. Even secular scientists agree it would not take millions of years to form Antarctica’s ice sheets. (Visited 34 times, 1 visits today)FacebookTwitterPinterestSave分享0
A partial lunar eclipse that was observed in New Delhi on Thursday. A total lunar eclipse as seen in Manila, Philippines.The moon’s bright white glow turned crimson brick red when it delved into the dark centre of the Earth’s shadow during the century’s longest and darkest lunar eclipse. The awesome spectacle of the moon being eclipsed was visible all over the country, including the national Capital.The full moon appeared much dimmer than usual, but sunlight passing through the Earth’s atmosphere gave the lunar surface a deep reddish hue.”This was the century’s longest and darkest total lunar eclipse as the moon immersed deeply inside the umbral (darker) shadow of the Earth,” Nehru Planetarium Director N. Rathnasree said.The total phase of the eclipse lasted 100 minutes. The last eclipse to exceed this duration was in July 2000.The next such eclipse will take place in 2141.”The penumbral lunar eclipse began at 22:54:34 IST and will end at 04:30:45 IST,” Rathnasree said. The total lunar eclipse began at 00:52:30 IST and ended at 02:32:42 IST.As the earth came in between the sun and the moon, its shadow first began sweeping across the moon blocking out much of its bright light and as the shadow descended gently, the moon’s face turned red.A lunar eclipse occurs when the Earth in course of its orbit around the Sun, comes between the moon and sun in such a way that moon is hidden in the shadow cast by the Earth.”This can occur only when the sun, earth, and moon are aligned in a straight line,” C.B. Devgun from Science Popularisation Association of Communicators and Educators (SPACE) said.advertisement”People living in eastern Africa, the Middle East, central Asia and western Australia were able to watch the entire eclipse, from beginning to end,” Arvind Paranjpye, scientific officer of Inter-University Centre for Astronomy and Astrophysics, said.”Thursday’s eclipse is also one of the darkest due to the ashes thrown into the Earth’s atmosphere by the recent eruption of Iceland’s most active volcano, Grimsvotn,” he said. An all night lunar eclipse ‘Moon Carnival’ was celebrated by sky enthusiasts in the Capital.- With PTI inputsFor more news on India, click here.For more news on Business, click here.For more news on Movies, click here.For more news on Sports, click here.