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Home NASA

Does the Milky Method orbit something?

May 28, 2024
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Does the Milky Method orbit something?
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It looks as if the whole lot orbits one thing in area. Moons orbit planets. Planets orbit stars. Stars orbit the facilities of galaxies. However past that, issues get a little bit more durable to visualise. Do galaxies — and, particularly, the Milky Method — orbit something?

To reply that, we first must know the way orbits work. Contemplate two objects orbiting one another. These two our bodies exert a gravitational pull on one another, retaining them certain collectively. The objects orbit their widespread heart of mass — when you might shrink the system, the middle of mass can be the purpose the place you can steadiness it in your finger. However within the case of the photo voltaic system, or Earth and the moon, one of many objects is far bigger than the opposite. The middle of mass finally ends up mendacity contained in the bigger physique, so the bigger object does not transfer a lot and the smaller object strikes on a roughly round path across the greater one.

At bigger scales, issues get a little bit extra difficult. Our galaxy is a part of a set of galaxies referred to as the Local Group, which incorporates the Milky Method; the Andromeda galaxy; a smaller spiral galaxy referred to as Triangulum; and several other dwarf galaxies, together with the Giant and Small Magellanic Clouds. The Milky Method and Andromeda are the 2 largest objects within the Native Group. As a result of their lots are comparable, the middle of mass lies between the 2 galaxies, mentioned Sangmo Tony Sohn, an astronomer on the Area Telescope Science Institute in Maryland. There’s nothing considerably bigger than both galaxy close by, so the 2 find yourself orbiting one another.

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However the Milky Method’s orbit is not round or elliptical just like the orbits of planets across the solar. “It’ll be bizarre to say if the Milky Method is orbiting round one thing, as a result of that form of implies that there is a greater object,” Sohn informed Dwell Science. “However that is not the idea right here.”

As a substitute, each the Milky Method and Andromeda are on principally radial orbits. “Think about the gravity of two issues pulling on one another, and so they’re not transferring in any manner aside from the gravitational pull. They may simply transfer straight on the road in the direction of one another. That is a purely radial orbit,” mentioned Chris Mihos, an astronomer at Case Western Reserve College in Ohio. The Milky Method’s orbit is not completely radial as a result of there is a little bit of sideways movement between the 2 galaxies, Mihos informed Dwell Science.

The Milky Way and some trees in the mountains of San Diego County

The Milky Method (seen right here) will collide with the Andromeda galaxy in about 4.5 billion years. (Picture credit score: Kevin Key/Shutterstock)

Their principally radial orbits towards one another imply that the Milky Method and Andromeda will ultimately collide, some 4.5 billion years from now. Particular person stars seemingly will not crash into one another due to the massive distances between them, so the galaxies will cross by means of one another and separate once more — however not for lengthy. 

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“The galaxies [will] then flip round and are available again collectively. And, over the course of a whole lot of tens of millions or billions of years, they will really merge collectively into one huge galaxy,” Mihos mentioned.

The gravitational interactions will seemingly jostle the celebs in each galaxies sufficient to make the mixed galaxy an elliptical galaxy moderately than a spiral one just like the Milky Method and Andromeda. The merger might additionally warmth the gasoline alongside every galaxy’s spiral arms sufficient to kind new stars, Sohn mentioned.

Orbits on scales bigger than galaxy teams are even much less outlined, however “we definitely know the Native Group is transferring,” Mihos mentioned. The Native Group is being pulled towards the Virgo Cluster, which comprises a number of hundred galaxies and lies about 65 million light-years away. However the Native Group won’t ever make it there, Mihos mentioned, as a result of the expansion of the universe is pulling the Milky Method away sooner than the gravitational pull of the Virgo Cluster is drawing it in.



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