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Throughout the Milky Way there are a number of stellar streams, gatherings of stars that were once dwarf galaxies or clusters. In ancient history they collided with the Milky Way and were torn apart -- leaving a stream of orbiting stars that circle the galactic centre. One such stellar stream, dubbed S1 and discovered last year by scientists examining data from the European Space Agency's Gaia satellite, passes directly through the path of our sun. As our solar system speeds through the outer reaches of the Milky Way, it flies through dark matter at around 230 kilometres per second ( around 143 miles per second). A study, published Nov. 7 and led by researchers at the University of Zaragoza, suggests that the dark matter present in the stream may be travelling at double that speed -- roughly 500km/s (around 310 miles per second) -- giving us a much better chance at detecting dark matter.
While we have never directly detected dark matter, and we’re not entirely sure what it is, we know ‘something’ must be there. Think of it like wind in the sails of a ship: we can see its impact on the world right in front of us, but it might be difficult to point it out directly.
Our Solar System lies directly in S1’s path but, despite the fact that it contains 30,000 stars or so, we’re not due for a cosmic KO anytime soon. Thankfully, everything is spread out nicely. However, barreling along in S1’s wake is a vast array of dark matter flotsam and jetsam.
originally posted by: Dr UAE
can't understand predicting something we've never seen and never detected to hit us and get affected
could someone explain
not sure how this article detected dark matter to be able to predict where it is going to end up
originally posted by: Jonjonj
An undetectable, and therefore a non reactive THING is going to kill us.
I call FAKE!
but it shouldn't cause any damage. In fact, in the hunt for the mysterious particle (or particles) that makes up dark matter, the "hurricane" may provide our best chance at detection.
A team of researchers from Universidad de Zaragoza, King's College London and the Institute of Astronomy in the U.K. has found that a "dark matter hurricane" passing through our solar system offers a better than usual chance of detecting axions.
As S1 moved through our area, theory suggests dark matter should have been moving along with it. Calculations by the team suggest it should be moving at approximately 500 km/s. They created several models showing the distribution of the dark matter and its density. Doing so allowed them to create predictions of possible signatures of the stream for researchers to look for. They suggest this event gives those in the field looking for observable evidence of dark matter a better than normal chance to do so. They suggest that it is not likely that WIMP detectors will find anything unusual.
originally posted by: Vroomfondel
When you model space based on orbital paths you can tell why things move the way they do. However, in order to make it all work there has to be some extra sources of gravity of varying intensity at any of a number of locations. Multiple combinations of these extra gravity sources can achieve the exact same results. The problem is that when we look where these sources of gravity are supposed to be we don't see anything. That means either there is another force at work we don't know about or there is a gravity source there we can't see. Science opts for the latter and calls it dark matter. Undetectable to us except for its gravitational affects.