Some Of Earth’s Water Could Be A Million Years Older Than The Solar System

Monday, September 29, 2014

Some Of Earth’s Water Could Be A Million Years Older Than The Solar System

Some Of Earth’s Water Could Be A Million Years Older Than The Solar System:

A view of rivers in Montana, USA, from the ISS. Credit: ESA/Luca Parmitano.

A new model suggests that up to half of the water on Earth may be older than the Sun and the rest of the Solar System. The model indicates that much of our planet’s water originated in the molecular cloud that created our Solar System, rather than the disc of material that was orbiting the Sun 4.6 billion years ago.

“Chemistry tells us that Earth received a contribution of water from some source that was very cold – only tens of degrees above absolute zero, while the Sun being substantially hotter has erased this deuterium, or heavy water, fingerprint,” stated Ted Bergin, an astronomy professor at the University of Michigan who participated in the research.

“We let the chemistry evolve for a million years – the typical lifetime of a planet-forming disk – and we found that chemical processes in the disk were inefficient at making heavy water throughout the solar system. What this implies is if the planetary disk didn’t make the water, it inherited it. Consequently, some fraction of the water in our solar system predates the Sun.”

What this could mean is that water would be quite abundant in young solar systems since it doesn’t depend on the chemistry of the planetary disc, but what is in molecular clouds — making it easier, perhaps, for water to arise in planets.

The researchers’ work was published in Science.

Source: University of Michigan

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The National Aeronautics and Space Administration (NASA) is the United States government agency responsible for the civilian space program as well as aeronautics and aerospace research. President Dwight D. Eisenhower established the National Aeronautics and Space Administration (NASA) in 1958 with a distinctly civilian (rather than military) orientation encouraging peaceful applications in space science. The National Aeronautics and Space Act was passed on July 29, 1958, disestablishing NASA's predecessor, the National Advisory Committee for Aeronautics (NACA). The new agency became operational on October 1, 1958.

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The Oxford English Dictionary defines a UFO as "An unidentified flying object; a 'flying saucer'." The first published book to use the word was authored by Donald E. Keyhoe. The acronym "UFO" was coined by Captain Edward J. Ruppelt, who headed Project Blue Book, then the USAF's official investigation of UFOs. He wrote, "Obviously the term 'flying saucer' is misleading when applied to objects of every conceivable shape and performance. For this reason the military prefers the more general, if less colorful, name: unidentified flying objects. UFO (pronounced Yoo-foe) for short." Other phrases that were used officially and that predate the UFO acronym include "flying flapjack", "flying disc", "unexplained flying discs", "unidentifiable object", and "flying saucer". The phrase "flying saucer" had gained widespread attention after the summer of 1947. On June 24, a civilian pilot named Kenneth Arnold reported seeing nine objects flying in formation near Mount Rainier. Arnold timed the sighting and estimated the speed of discs to be over 1,200 mph (1,931 km/h). At the time, he described the objects' shape as being somewhat disc-like or saucer-like, leading to newspaper accounts of "flying saucers" and "flying discs". In popular usage the term UFO came to be used to refer to claims of alien spacecraft. and because of the public and media ridicule associated with the topic, some investigators prefer to use such terms as unidentified aerial phenomenon (or UAP) or anomalous phenomena, as in the title of the National Aviation Reporting Center on Anomalous Phenomena (NARCAP).

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Monday, September 29, 2014