Beijing time:2022-10-09 12:32
[NTD, ora di Pechino, 9 ottobre 2022]Although people cannot see or hear, scientists claim that is where our solar system is locatedMilky Way, as if thrown into a stone, ripples appear and the water ripples. And this stone is our neighbor –Sagittarius dwarf galaxy(Sagittarius dwarf galaxy) – It is the size of 400 million suns. The fluctuations that are now observable in the Milky Way are the result of the collision of these two galaxies.
But don’t be nervous, the ripples won’t hurt you – in fact, according to a new study published Sept. 15 in the Royal Astronomical Society’s Monthly Notices, the ancient fluctuations could tell us a lot about the chaos of the Milky Way history.
Importantly, the collision of the two galaxies occurred billions of years ago. Everything astronomers see now is the result of an ancient cosmic collision. But that said, if we can’t actually see or feel the residual ripple, how would we know it’s there?
To examine the oscillation of the universe, an international team of researchers used data from the European Space Agency’s Gaia Space Observatory to study more than 20 millionMilky WayMovement of the stars, tracking and comparison of changes in their positions. use”Galactic Seismology”(Galactic Seismology), they simulatedSagittarius dwarf galaxyThe ripples of the collision and its timing, thought to have occurred hundreds of millions of years ago.
“We could see stars swinging and swinging at different speeds,” co-author Paul McMillan, an astronomer at the Swedish University of Lund, explained in a statement.
As the Live Science website states, while previous research knew that the Milky Way we live in is actually producing ripples, the latest study reveals for the first time that the impact of the impact has spread across the galaxy, with ripples that extend to the edge of the Milky Way. It also shows that our neighbor, the Sagittarius dwarf galaxy, was much larger at the time than it is now.
The study also confirmed the hypothesis that the Milky Way and the dwarf Sagittarius collided not once, but many times, over the course of the universe’s evolutionary history. It gives us a fascinating glimpse into the origins of the Milky Way and its neighbors; at the same time, studies on the ancientcollision of galaxieswhich helps us understand possible future collisions.
(Transfer from The Epoch Times / Editor in charge: Ye Ping)
URL of this article: https://www.ntdtv.com/b5/2022/10/07/a103546368.html
