Late in the evening of February 28, 2021, a coal-dark space rock about the size of a soccer ball fell through the sky over northern England. The rock blazed in a dazzling, eight-second-long streak of light, split into fragments and sped toward the Earth. The largest piece went splat in the driveway of Rob and Cathryn Wilcock in the small, historic town of Winchcombe.
An analysis of those fragments now shows that the meteorite came from the outer solar system, and contains water that is chemically similar to Earth's, scientists report November 16 in Science Advances. How Earth got its water remains one of science's enduring mysteries. The new results support the idea that asteroids brought water to the young planet (SN: 5/6/15).
[...] "It's as pristine as we're going to get from a meteorite," King says. "Other than it landing in the museum on my desk, or other than sending a spacecraft up there, we can't really get them any quicker or more pristine."
After collecting about 530 grams of meteorite from Winchcombe and other sites, including a sheep field in Scotland, King and colleagues threw a kitchen sink of lab techniques at the samples. The researchers polished the material, heated it and bombarded it with electrons, X-rays and lasers to figure out what elements and minerals it contained.
[...] The meteorite is a type of rare, carbon-rich rock called a carbonaceous chondrite, the team found. It came from an asteroid near the orbit of Jupiter, and got its start toward Earth around 300,000 years ago, a relatively short time for a trip through space, the researchers calculate.
Chemical analyses also revealed that the meteorite is about 11 percent water by weight, with the water locked in hydrated minerals. Some of the hydrogen in that water is actually deuterium, a heavy form of hydrogen, and the ratio of hydrogen to deuterium in the meteorite is similar to that of the Earth's atmosphere. "It's a good indication that water [on Earth] was coming from water-rich asteroids," King says.
Researchers also found amino acids and other organic material in the meteorite pieces. "These are the building blocks for things like DNA," King says. The pieces "don't contain life, but they have the starting point for life locked up in them."
A. King et al. The Winchcombe meteorite, a unique and pristine witness from the outer solar system. Science Advances. Published online November 16, 2022. doi: 10.1126/sciadv.abq3925.
(Score: 0) by Anonymous Coward on Monday November 21 2022, @08:11PM (1 child)
The earth came from asteroids
(Score: 2) by takyon on Tuesday November 22 2022, @12:01AM
[SIG] 10/28/2017: Soylent Upgrade v14 [soylentnews.org]
(Score: 1, Troll) by krishnoid on Monday November 21 2022, @09:23PM (2 children)
So if Earth needed to get its water from an asteroid collision, then (for argument's sake) presuming water is a building block of any sort of life, how does *that* factor into the Drake equation?
(Score: 0) by Anonymous Coward on Tuesday November 22 2022, @01:27AM
Love the Drake!
(Score: 2, Insightful) by khallow on Friday December 02, @07:54PM
Probably rather weak since hydrogen is by far the most common element in the universe and oxygen would likely come in with the "metal-rich" [wikipedia.org] (that is, any element heavier than helium in quantity) dust clouds that would be needed. For example, we have two scenarios which naturally generate metal-rich dust with oxygen present - dust shedded by old, active stars as either a solar wind or flare, and supernova. It's also likely that neutron star and white dwarf collisions, jets from black holes and neutron stars, and break up of a older star due to a near pass by another massive object would work as well.
In other words, once you have a metal-rich environment, which would be necessary for any sort of life based on chemistry, you'll have oxygen and thus, at least initially water. My guess is that the same processes that drove out and later returned water to Earth would apply to anywhere where water could exist in liquid form.