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"The proposal by Seligman and Laughlin appeared promising because it might explain the extreme elongated shape of 'Oumuamua as well as the non-gravitational acceleration.
"We wanted to not only test the assumptions in the theory but also the dark matter proposition." Dr. Avi Loeb, Frank B. Baird Professor of Science at Harvard and co-author on the paper, added, "We were suspicious that hydrogen icebergs could not survive the journey—which is likely to take hundreds of millions of years—because they evaporate too quickly, and as to whether they could form in molecular clouds."
Traveling at a blistering speed of 196,000mph in 2017, 'Oumuamua was first classified as an asteroid, and when it later sped up, was found to have properties more akin to comets. But the 0.2km radius interstellar object didn't fit that category, either, and its point of origin has remained a mystery.
Researchers focused on the giant molecular cloud (GMC) W51—one of the closest GMCs to Earth at just 17,000 light years away—as a potential point of origin for 'Oumuamua, but hypothesize that it simply could not have made the journey intact. "The most likely place to make hydrogen icebergs is in the densest environments of the interstellar medium. These are giant molecular clouds," said Loeb, confirming that these environments are both too far away and are not conducive to the development of hydrogen icebergs.
Although the study explored destruction of H2 ice by multiple mechanisms including interstellar radiation, cosmic rays, and interstellar gas, sublimation due to heating by starlight has the most destructive effect, and according to Loeb, "Thermal sublimation by collisional heating in GMCs could destroy molecular hydrogen icebergs of 'Oumuamua-size before their escape into the interstellar medium." This conclusion precludes the theory that 'Oumuamua journeyed to our solar system from a GMC, and further precludes the proposition of primordial snowballs as dark matter. Evaporative cooling in these situations does not reduce the role of thermal sublimation by starlight in the destruction of H2 ice objects.
The comet is record-breaking because it is already becoming active under the feeble glow of the distant sun. Astronomers have never seen an active inbound comet this far out, where sunlight is merely 1/225th its brightness as seen from Earth. Temperatures, correspondingly, are at a minus 440 degrees Fahrenheit. Even at such bone-chilling temperatures, a mix of ancient ices on the surface – oxygen, nitrogen, carbon dioxide, and carbon monoxide – is beginning to sublimate and shed as dust. This material balloons into a vast 80,000-mile-wide (130,000-km-wide) halo of dust, called a coma, enveloping the solid nucleus.
originally posted by: CrazeeWorld777
a reply to: gortex
A huge Spaceship disguised as a Comet doing a flyby and either they didnt like what they saw or they will be back. If they come back, with what intentions?
Of course, our Leaders will be prepared for war first and ask questions later as that's what they do...