KASTING, J. F. (2003). The origins of water on earth. Scientific American, special edition : "New light on the solar system", vol. 13(n°3), pp. 28-33.Kasting, J.F., 2003. The origins of water on Earth. Sci. Am. 13, 28-33....
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Other work favors an alternative explanation. This work found that the hydrogen isotope ratio(the proportion of different forms of hydrogen) of ice in comets may be different from that of water on Earth. It instead emphasizes that the chemical composition of water on Earth resembles that of the...
away from Earth by the solar wind (a stream of charged particles emitted by the Sun). If this were true, then the elements needed to form water on Earth would not have been freely available. As a consequence, it was proposed that collisions with icy comets or similar gas-and water-rich...
Origins of Earth's Salty Oceans Scientists have long been interested in discovering the origin of Earth's water and establishing why Earth's oceans are so salty There has been speculation that earliest Earth was so hot that no liquid water existed, and all light elements (such as hydrogen ...
This work found that the hydrogen isotope ratio(the proportion of different forms of hydrogen) of ice in comets may be different from that of water on Earth. It instead emphasizes that the chemical composition of water on Earth resembles that of the small percentage of water contained within ...
5、Other work favors an alternative explanation. This work found that the hydrogen isotope ratio(the proportion of different forms of hydrogen) of ice in comets may be different from that of water on Earth. It instead emphasizes that the chemical composition of water on Earth resembles that of...
There's sort of these two alternatives for how you could have had life arise on Earth, and one is that the very basic building blocks, like water, and methane, and CO2 – like, those molecules were definitely brought to Earth by ices in comets, and maybe once they were on Earth, then...
The first experimental demonstration that complex molecules could have evolved naturally from simpler ingredients found on the primitive Earth came in 1953.Scientists Harold Urey and Stanley Miller took a mixture of the materials thought to be present on Earth long ago-water,methane,carbon dioxide,and...