2:57 End of an era for space exploration Share your voice Now playing: Watch this: A composite image of Kepler’s final view. The missing tiles are due to parts of the camera that failed. NASA The final thing NASA’s Kepler Space Telescope captured was everything, or at least it looks that way.NASA ran out of fuel last year and was put into a permanent sleep mode on Oct. 30. The final full-field image it took can be seen in the above mosaic captured Sept. 25. You can see the telescope’s full view of the sky and an abundance of stars within. Some blocks of the composite image are blacked out due to failures by parts of the camera. Fortunately, the device had a modular design that allowed for other parts of the image to be retained. Kepler helped revolutionize how we think about the universe by enabling the discovery of thousands of exoplanets beyond our solar system, making it clear our galaxy and others are packed with other worlds. Enlarge ImageKepler’s view of K2-138 with its six planets sized between Earth and Neptune. It was the first multi-planet system entirely discovered by citizen scientists. NASA/Ames Research Center But it struggled to make some of those discoveries. A few years into its mission, the parts that help it stay pointed at a target began to fail. Engineers had to come up with a work-around that basically used the subtle pressure coming off the sun itself to keep the telescope steady. Kepler went on making more finds for half a decade before finally running out of gas. To the right is one of the later star systems Kepler helped discover called K2-138. It is believed to host six planets roughly between the sizes of Earth and Neptune. The GIF shows images collected of the system during Kepler’s last day of photography.The pixelated view might not be much to look at, but Kepler played a pivotal role in pointing the way towards promising systems like this so that future telescopes might provide a clearer view one day, and perhaps even find evidence of alien life. NASA turns 60: The space agency has taken humanity farther than anyone else, and it has plans to go further.Crowd Control: A crowdsourced science fiction novel written by CNET readers. 1 Comment Sci-Tech Tags NASA Space
The accused being taken to Tangail court. Photo: Tangail A Tangail court on Monday sentenced four persons to death in a case filed over the murder of Zakia Sultana Rupa after gang rape in a running bus on 25 August last year, reports UNB.Women and Children Repression Prevention Tribunal judge Abul Hossain Miah announced the verdict in a crowded courtroom.The condemned convicted are – bus driver Habibur and helpers Shamim, Akram and Jahangir.Besides, bus supervisor Safar Ali was sentenced to seven years imprisonment and fined Tk 100,000.According to prosecution, Rupa, 27, was murdered after gang rape in the running bus while returning to Mymensingh from Bogra.Police recovered her blood-stained body from Panchmail area of Madhupur upazila on that night.Following a post-mortem, she was buried at the town central graveyard as unclaimed body. Later, victim’s relatives identified her.On 28 August, police arrested the five accused from Mymensingh in this connection.On 31 August, police exhumed the body of Rupa and handed it over to her family for burial in a proper manner.On 25 October last, the court accepted the charge sheet against the accused — bus driver Habibur, its supervisor Safar Ali, and helpers Shamim, Akram and Jahangir — in the case.On 23 January, the court concluded the recording of depositions of witnesses in the case when 27 witnesses out of total 32 testified before the court.
Journal information: Nature Geoscience Scientists test powerful ocean current off Antarctica Citation: Researchers find new source for cold ocean water abyssal layer (2013, February 25) retrieved 18 August 2019 from https://phys.org/news/2013-02-source-cold-ocean-abyssal-layer.html Explore further Intense sea-ice production in the CDP, revealed from satellite data. Credit: Nature Geoscience (2013) doi:10.1038/ngeo1738 AABW is important because as it moves north from its source, it creates ocean currents that have a major impact on global climate. Until now however, scientists have only been able to identify three major sources—not nearly enough to explain the amount of AABW seen in the ocean. In this new research, the team suspected that a different type of source might be at play—one that came about in a polynya (area of open water that can’t freeze over due to rapid wind and water movement), rather than directly offshore of shelf ice. To find out they employed the use of traditional undersea sensors, and less traditionally, sensors attached to the heads of elephant seals.Ocean currents result from AABW due to the way it’s formed. When seawater freezes, much of the salt in the ice is pushed back into the water giving it a very high salinity—and because it’s also very cold, it tends to sink. As it hits the bottom it joins other cold water that slowly seeps toward the edge of the continental shelf, where if falls over into the abyss, rather like an under-the-ocean waterfall. That water falling is what generates the currents that flow north.Researchers had suspected for years that a source for AABW existed somewhere near what they call the Weddell Gyre, but had not been able to find it. In this new research, the team used satellite data to pick a likely polynya, and settled on Cape Darnley. There they sank sensors and studied data supplied by the elephant seal sensors. It was the data from the seals, the researchers report, that showed that areas in which they swam—at times as deep as 1,800 meters—revealed the layer of cold dense water the researchers were looking for—the fourth AABW source.After analyzing the Cape Darnley polynya source, the researchers have concluded that it is likely responsible for 6 to 13 percent of circumpolar AABW totals, which suggests they say, that other similar sources are out there still waiting to be found. (Phys.org)—An international team of ocean researchers has found a fourth source of Antarctic bottom water (AABW)—the very cold, highly saline layer of water that lies at the bottom of the ocean. In their paper published in the journal Nature Geoscience, the team describes how they discovered the site in the Cape Darnley polynya. More information: Antarctic Bottom Water production by intense sea-ice formation in the Cape Darnley polynya, Nature Geoscience (2013) doi:10.1038/ngeo1738AbstractThe formation of Antarctic Bottom Water—the cold, dense water that occupies the abyssal layer of the global ocean—is a key process in global ocean circulation. This water mass is formed as dense shelf water sinks to depth. Three regions around Antarctica where this process takes place have been previously documented. The presence of another source has been identified in hydrographic and tracer data, although the site of formation is not well constrained. Here we document the formation of dense shelf water in the Cape Darnley polynya (65°–69° E) and its subsequent transformation into bottom water using data from moorings and instrumented elephant seals (Mirounga leonina). Unlike the previously identified sources of Antarctic Bottom Water, which require the presence of an ice shelf or a large storage volume, bottom water production at the Cape Darnley polynya is driven primarily by the flux of salt released by sea-ice formation. We estimate that about 0.3–0.7×106 m3 s−1 of dense shelf water produced by the Cape Darnley polynya is transformed into Antarctic Bottom Water. The transformation of this water mass, which we term Cape Darnley Bottom Water, accounts for 6–13% of the circumpolar total. © 2013 Phys.org This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. The content is provided for information purposes only.