Earth Water or older than the sun

A new study shows that the Earth’s oceans at least half of the water may be even older than the sun.

Earth Water or older than the sun

Water may also be older than the sun on Earth. Source: ASA

A new study shows that the Earth’s oceans at least half of the water may be even older than the sun.

By the beginning of the reconstruction of the solar system disk of gas and dust, the scientists inferred that the Earth and other planets must inherit a lot of water from the sun in 4.6 billion years ago to form a cloud of gas there, but not all of the water in the late formation. The researchers said that the water of these interstellar also exist in other star systems, and even Earth-like planet formation process.

Between the formation of stars and dust clouds of dense interstellar gas contains a large presence in the form of ice water. When the first star is lit, it will cloud around the heating and spread outward in the form of radiation, while evaporating ice, and some of the water molecules into hydrogen and oxygen.

So far, researchers have not yet aware of these “old” water in the end how many survived after this process. If most of the raw water molecules are broken, then the early solar system would have to re-form water. But the leader of the new study, University of Michigan, Ann Arbor celestial American chemist Ilsedore Cleeves noted that there could only happen in the solar system will all of this, and many other stars systems may still dry.

Cleeves said that if there is some water in the star formation process can be survived, and if the solar system is very typical example, this means that the water “process will be available in ordinary matter planetary formation.”

To find answers to your questions, Cleeves and her colleagues simulated scene shortly after the formation of the sun. The researchers estimated the number of radiation from the solar system encounters young stars and outer space, as well as the thickness of the radiation can pass through clouds.

These conditions determine how the hydrogen and oxygen to form a new water molecules, in particular the single proton addition to the usual formation probability of containing deuterium (an isotope of hydrogen, the nucleus contains a neutron) molecules. The model predicts that the abundance of deuterium-containing water (the so-called heavy water) is lower than today’s solar system abundances of heavy water.

However, compared with the current of the solar system, is being formed such as the sun, but the former star of the interstellar cloud has a higher proportion of heavy water. This is because these clouds suffered a continuous bombardment of cosmic rays, which tend to form water containing deuterium. Therefore, the authors conclude, the young solar radiation is not sufficient to explain the amount of heavy water in the solar system are seeing today, and some of the heavy water must already exist before. The researchers estimate that the Earth’s oceans about 30% to 50% of the water must be older than the sun.

The researchers explained that if the water is formed in the cold environment of the interstellar medium, the deuterium to hydrogen abundance ratio will be higher, up to about 1%; while if it is hotter environment during the formation of the solar system formed, So the abundance of deuterium to hydrogen ratio will be lower, close to about 0.002%, but the actual observations comets, planets, meteorites and Earth’s oceans is generally somewhere between these two extremes, such as the Earth’s oceans in both abundance ratio is 0.016%.

Cleeves said: “If you can not meet it all after the formation of the sun, which means that we will inherit a certain level of deuterium-rich interstellar ice from the birth of the sun’s environment.”

Researchers at the American Journal September 25 issue of “Science” reported the results of this study.

Leiden Observatory celestial chemist Ewine van Dishoeck think, based on the conclusions of the study a good argument, but still limited to theory. She stressed that next year will be expected to prove all of this, then located in Chile 利阿塔卡玛 radio telescope in the desert – the Atacama Large Millimeter Array telescope will begin to study the proportion of heavy water chemical processes behind the protoplanetary disk.

But the French city of Grenoble Institute of Astrophysics and Planetary Science astronomer Cecilia Ceccarelli said, even though the formation of stellar systems typically do not destroy all the water that existed before, but it does not mean that the planet would have been drenched throughout the universe. Venus and Mercury, and no water, and Mars seems to have lost its once owned most of the water.

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