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luni, 9 martie 2015

NASA Research Suggests Mars Once Had More Water than Earth’s Arctic Ocean

A primitive ocean on Mars held more water than Earth’s Arctic Ocean, according to NASA scientists who, using ground-based observatories, measured water signatures in the Red Planet’s atmosphere.

Scientists have been searching for answers to why this vast water supply left the surface. Details of the observations and computations appear in Thursday’s edition of Science magazine.
“Our study provides a solid estimate of how much water Mars once had, by determining how much water was lost to space,” said Geronimo Villanueva, a scientist at NASA’s Goddard Space Flight Center in Greenbelt, Maryland, and lead author of the new paper. “With this work, we can better understand the history of water on Mars.”

Perhaps about 4.3 billion years ago, Mars would have had enough water to cover its entire surface in a liquid layer about 450 feet (137 meters) deep. More likely, the water would have formed an ocean occupying almost half of Mars’ northern hemisphere, in some regions reaching depths greater than a mile (1.6 kilometers).

miercuri, 19 noiembrie 2014

V. Kernbach -- Enigmele Miturilor Astrale

Квантовая механика – следствие теории струн?

Исследователи из Университета  Южной Калифорнии предприняли попытку объяснить происхождение принципа неопределенности в  квантовой механике, выведя его из струнной теории поля.

Квантовая механика представляет собой основу современной физики микромира и при всей своей парадоксальности прекрасно работает во всех известных ее разделах. Более того, из нее можно вывести и классическую физику (как предел квантовой механики, устремляя к нулю постоянную Планка h, определяющую за квантовые явления). Так что можно говорить о всеобщности законов квантовой механики. Но, несмотря на огромный успех, у нее есть существенный недостаток. Один из краеугольных камней квантовой механики, принцип неопределенности Гейзенберга (например, неопределенность в определении положения и импульса), не имеет никаких обоснований. Разумеется, практический успех – достаточное оправдание, чтобы принять это таинственное правило, но это не останавливает поисков физиками его объяснения.

miercuri, 30 octombrie 2013

Zimbabwe: Four Matobo Schools Hit By Goblin Menace

FOUR schools in Matobo District, Matabeleland South, have been forced to stop lessons due to a rather arcane infestation: goblins.

Local officials insist that pupils at Lushumbe Primary, Mazhayimbe Primary, Bhazha Secondary and Tokwe Secondary schools have been terrorised by goblins.

Many parents have stopped sending their children to school.

Четыре зимбабвийские школы закрылись из-за гоблинов

Начальные и средние школы в зимбабвийской провинции Южный Матабелеленд закрылись из-за того, что их ученики страдали от нападений гоблинов. Всего работу прекратили четыре учебных заведения, сообщает

Решение о прекращении работы школ было принято после серий атак, предпринятых страшными существами. Как рассказал местный старейшина, дети впадали в панику и продолжать уроки становилось невозможным. Первые нападения были совершены в августе 2013 года, и к октябрю многие родители перестали водить своих детей на занятия.

vineri, 6 septembrie 2013

Evidence Found for Planet-Cooling Asteroid 12,900 Years Ago

The dust refuses to settle on a debate about whether asteroid impacts caused one of Earth’s most famous cold snaps 12,900 years ago.

The latest evidence in the contentious discussion comes in the form of pieces of bedrock from Quebec, Canada, that seem to have been blasted out as far as Pennsylvania. “I’d say there’s evidence of an impact happening, for sure,” says Mukul Sharma, an isotope geochemist at Dartmouth College in Hanover, New Hampshire, and co-author of a study published this week in Proceedings of the National Academy of Sciences.

joi, 5 septembrie 2013

Gravity variations much bigger than previously thought

A joint Australian-German research team led by Curtin University's Dr Christian Hirt has created the highest-resolution maps of Earth's gravity field to date - showing gravitational variations up to 40 per cent larger than previously assumed.
Using detailed topographic information obtained from the US Space Shuttle, a specialist team including Associate Professor Michael Kuhn, Dr Sten Claessens and Moritz Rexer from Curtin's Western Australian Centre for Geodesy and Professor Roland Pail and Thomas Fecher from Technical University Munich improved the resolution of previous global gravity field maps by a factor of 40.

miercuri, 4 septembrie 2013

Milky Way Gas Cloud Causes Multiple Images of Distant Quasar

For the first time, astronomers have seen the image of a distant quasar split into multiple images by the effects of a cloud of ionized gas in our own Milky Way Galaxy. Such events were predicted as early as 1970, but the first evidence for one now has come from the National Science Foundation's Very Long Baseline Array (VLBA) radio telescope system.

The scientists observed the quasar 2023+335, nearly 3 billion light-years from Earth, as part of a long-term study of ongoing changes in some 300 quasars. When they examined a series of images of 2023+335, they noted dramatic differences. The differences, they said, are caused by the radio waves from the quasar being bent as they pass through the Milky Way gas cloud, which moved through our line of sight to the quasar.

The Milky Way Supernova You've Never Heard Of

Every year astronomers see hundreds of supernovae erupt in other galaxies, but from such great distances these stellar explosions look only like bright dots. Researchers therefore prize the few supernovae that past observers witnessed in the Milky Way, where telescopes can scrutinize the wreckage. Since the year A.D. 1000, skywatchers have seen five of our galaxy's stars die in brilliant explosions. Now a new distance determination to the most mysterious of these is yielding new insight into its nature.

sâmbătă, 31 august 2013

What is a Wormhole?

 A wormhole is a theoretical passage through space-time that could create shortcuts for long journeys across the universe. Wormholes are predicted by the theory of general relativity. But be wary: wormholes bring with them the dangers of sudden collapse, high radiation and dangerous contact with exotic matter.

Wormhole theory

In 1935, physicists Albert Einstein and Nathan Rosen used the theory of general relativity to propose the existence of "bridges" through space-time. These paths, called Einstein-Rosen bridges or wormholes, connect two different points in space-time, theoretically creating a shortcut that could reduce travel time and distance.