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Canadian scientists share composite image of dark matter
Two Canadian scientists claimed to have constructed a composite a picture of dark matter filaments that supposedly make up the so-called cosmic web.
Scientists believe that the universe may be anything but random and that the whole thing is actually organized and linked to one another in a manner similar to a colossal spider web.
The two scientists from Ontario, Canada-based University of Waterloo made use of a special technique dubbed weak gravitational lensing to construct a composite a picture of dark matter filaments.
They used numerous gravitational lensed images of nearly 23,000 galaxy pairs to show the presence of dark matter in between the galaxies.
The duo also estimated that the dark matter filament connections are strongest between galaxy systems that are less than forty million light-years apart.
Meanwhile, NASA’s MAVEN spacecraft has detected presence of metal in Mars’ atmosphere.
Joseph Grebowsky of the agency’s Goddard Space Flight Center told reporters that the orbiting spacecraft made the first direct detection of presence of metallic ions in the Red Planet’s ionosphere.
Dark matter, a mysterious substance that comprises around 25 per cent of the universe, doesn’t shine, absorb or reflect light, which has traditionally made it largely undetectable, except through gravity.
“For decades, researchers have been predicting the existence of dark-matter filaments between galaxies that act like a web-like superstructure connecting galaxies together,” said Mike Hudson, a professor of astronomy at the University of Waterloo. “This image moves us beyond predictions to something we can see and measure.”
As per Tech Times report, “University of Amsterdam physicist Erik Verlinde claims that dark matter is not necessary to explain the effects that have been attributed to it and offers a new theory of gravity that does not necessitate the involvement of dark matter in the motion of stars in galaxies.”
Study lead researcher Margot Brouwer of Leiden Observatory in the Netherlands, said, “The dark matter model actually fits slightly better with the data than Verlinde's prediction. But then if you mathematically factor in the fact that Verlinde's prediction doesn't have any free parameters, whereas the dark matter prediction does, then you find Verlinde's model is actually performing slightly better.”
The research paper detailing the observations of the team has been published in Monthly Notices of the Royal Astronomical Society.