Our Milky Manner has cannibalized a neighbor for it to grow to be the galaxy we see right now.
The galaxy Our Milky Manner is born into violence and scientists are nonetheless reconstructing a picture of the cosmic crime scene.
The Gaia Area Telescope of the European Area Company, an instrument that may find greater than a billion stars, is a necessary instrument on this course of. The data gathered permits astronomers to grasp how the Milky Manner absorbed a second galaxy within the early days of the universe, a steady course of that’s the topic of an article revealed final week.
"Till now, all of the predictions and cosmological observations of distant galaxies much like the Milky Manner point out that this violent section of fusion between smaller constructions was very frequent," defined astronomer Matteo Monelli. Canary Island Astrophysics Institute. writer of the article, stated in an announcement. However scientists are nonetheless determining what occurred to the development of the galaxy we all know and love.
Associated: Lovely images of our Milky Manner (Gallery)
It’s there that intervenes Gaia's ever-growing reserve of sightings. Observations of the place of the telescope have allowed scientists to return in time the place all these stars traveled, and Gaia also can research the composition of those stars.
Astronomers had already seen that quite a lot of stars within the Milky Manner appeared extra blue than one other group, marking two completely different ancestral galaxies within the present construction. Gaia's knowledge made the brand new analysis doable, permitting a workforce of astronomers to find out that these two teams have been about the identical age – and that each one these stars have been older than these of the Milky Manner disk. . The brand new analysis additionally urged that if quite a lot of older stars is especially made up of hydrogen and helium, the opposite lot accommodates bigger quantities of heavier components .
Which means the present historical past of the Milky Manner appears just about like this: 13 billion years in the past, there was a small galaxy nicknamed Gaia-Enceladus and the ancestor of our Manner Milky, 4 instances bigger and richer in heavier components. About 10 billion years in the past, the 2 collided, and about four billion years later, a spurt of star formation created the final phase of the Milky Manner.
The brand new analysis is described in an article revealed July 22 within the journal Nature Astronomy.
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