Sunday, August 2, 2009

Evidence Of Liquid Water

The watery environment of early comets, together with the vast quantity of organics already discovered in comets, would have provided ideal conditions for primitive bacteria to grow and multiply.

Since the launch, the NASA operation and engineering team located at the NOAA Satellite Operation Facility have performed a series maneuvers designed to place the satellite in its proper orbit. They completed five liquid apogee motor burns designed to raise the GOES-O orbit perigee to approximately 22,300 miles above the Earth. GOES-O became GOES-14 once it reached its geosynchronous orbit at 89.5 degrees west longitude on July 8, 2009.

Professor Wickramasinghe said: "These calculations, which are more exhaustive than any done before, leaves little doubt that a large fraction of the 100 billion comets in our solar system did indeed have liquid interiors in the past.

So argue Professor Chandra Wickramasinghe and his colleagues at the Cardiff Centre for Astrobiology in a paper published in the International Journal of Astrobiology.

Am vazut multe ceasuri superbe pe www.topceas.ro


Am vazut multe ceasuri superbe pe www.topceas.ro


Am vazut multe ceasuri superbe pe www.topceas.ro


Am vazut multe ceasuri superbe pe www.topceas.ro


Am vazut multe ceasuri superbe pe www.topceas.ro


Am vazut multe ceasuri superbe pe www.topceas.ro


Am vazut multe ceasuri superbe pe www.topceas.ro

Dark Matter Origin

Several researchers have invoked a variety of dark matter to explain Integral’s observations. Dark matter is thought to exist throughout the Universe – undetectable matter that differs from the normal material that makes up stars, planets and us.

But the recent finding by a team of astronomers led by Richard Lingenfelter at the University of California at San Diego, proves otherwise. The astronomers show that the positrons formed by radioactive decay of elements left behind after explosions of massive stars are, in fact, able to travel great distances, with many leaving the thin Galactic disc.

It is also believed to be present within and around the Milky Way, in the form of a halo.

Combined with some other work by the researchers on sister elements to platinum, iridium and osmium, we also now have a new framework for understanding the variations in isotopic ratios of osmium with time.

Galaxies Lose Weight

D'Onghia and her colleagues used computer simulations to examine two scenarios for the formation of dwarf spheroidals: 1) an encounter between two dwarf galaxies far from giants like the Milky Way, with the dwarf spheroidal later accreted into the Milky Way, and 2) an encounter between a dwarf galaxy and the forming Milky Way in the early universe.

"The Sun makes fantastic natural experiments that allow us to test our ideas about its effects on the climate," says Prof.

The resulting NACO images almost reach the theoretical limit of sharpness attainable for an 8-metre telescope. The resolution is as fine as 37 milliarcseconds, which is roughly the size of a tennis ball on the International Space Station (ISS), as seen from the ground.

Henrik Svensmark, lead author of a report newly published in Geophysical Research Letters. When solar explosions interfere with the cosmic rays there is a temporary shortage of small aerosols, chemical specks in the air that normally grow until water vapour can condense on them, so seeding the liquid water droplets of low-level clouds. Because of the shortage, clouds over the ocean can lose as much as 7 per cent of their liquid water within seven or eight days of the cosmic-ray minimum.

Comets

In fact, astronomers know the inner solar system has been protected at least to some degree by Saturn and Jupiter, whose gravitational fields can eject comets into interstellar space or sometimes send them crashing into the giant planets. That point was reinforced July 20 when a huge scar appeared on Jupiter's surface, likely evidence of a comet impact.

There are about 3,200 known long-period comets. Among the best-remembered is Hale-Bopp, which was easily visible to the naked eye for much of 1996 and 1997 and was one of the brightest comets of the 20th century.Co-authors Dr Marco Fiorentini and Dr Wolfgang Maier from the University of Western Australia are delighted that this is a completely academic outcome which came out of an industry-funded project. By comparison, Halley's comet, which reappears about every 75 years, is perhaps the best-known comet, but it is a short-period comet, most of which are believed to originate in a different part of the solar system called the Kuiper Belt.

Am vazut multe ceasuri superbe pe www.topceas.ro


Am vazut multe ceasuri superbe pe www.topceas.ro


Am vazut multe ceasuri superbe pe www.topceas.ro


Am vazut multe ceasuri superbe pe www.topceas.ro


Am vazut multe ceasuri superbe pe www.topceas.ro


Am vazut multe ceasuri superbe pe www.topceas.ro


Am vazut multe ceasuri superbe pe www.topceas.ro