Milky way twice as wide as astronomers previously thought

[SIZE=7]Supersize me[/SIZE]
The Milky Way just got larger.
By Mara Johnson-Groh | Published: Tuesday, June 12, 2018
The Milky Way’s near neighbor, the Andromeda Galaxy.
Adam Evans
Despite residing in it, it’s hard for us to know exactly how big the Milky Way is. But new research has found that our galaxy is bigger than previously thought. Using a large survey of stars instead of just models (as previous researchers did), astronomers have now determined the disk of our galaxy to be 200,000 light-years across — twice as large as was believed a decade ago.

Astronomers know the Milky Way to be a spiral galaxy with a flat central disk composed of spiraling arms and a sparse outer cloud of stars called the halo. Most of the stars are found in the disk, which rapidly thins out at the edges. The size of the galaxy is measured from the point at which the number of stars in the disk significantly drops, so finding disk stars is key to determining the Milky Way’s size.

Fortuitously, disk stars tend to be much younger than the halo stars. Since stars gradually build up elements over generations, the disk stars’ composition can be differentiated from the halo stars, allowing astronomers to figure out which stars belong to which population.
An annotated map showing the Milky Way’s structure, based on measurements to distant stars and other objects.
Finding the outer reaches
With a process known as spectroscopy, researchers from the Instituto de Astrofísica de Canarias and at the National Astronomical Observatories of Beijing studied the chemical composition of over 4,600 stars from two surveys, APOGEE and LAMOST, and mapped out which stars are part of the disk and which belong to the halo. The results, published May 7 in the journal Astronomy and Astrophysics, clearly show disk stars much farther from center of the galaxy than before.

“Certainly, one would expect the existence of stars at very far distances from the galactic center, as part of the halo,” says Martín López Corredoira, lead author on the paper and researcher at Instituto de Astrofísica de Canaria. “But, as far as we know, nobody could previously say that stars [farther than 81,000 light-years] are confirmed spectroscopically to belong to the disk.”

Bigger, not heavier
The researchers still believe the density of stars at the edge tapers off in an exponential manner — just farther away than previously thought. Although its diameter has been supersized, the Milky Way is still smaller than its neighbor Andromeda, which measures over 220,000 light-years across.

While our galaxy is looking larger, it’s not putting on much weight. Because the outer reaches are much less dense than the center of the galaxy, the additional area is only sparsely populated with stars. These few extra stars are only a drop in the bucket compared to the rest of the galaxy, so overall the mass of the Milky Way remains largely unchanged.

supposing it is four times larger?

Nothing big since Milky Way is still less dense. It could, however, lead to new simulations of the coming merger between Milky Way and Andromeda.

i believe deep in there is another planet which supports life. we are just not advanced enough to explore it

Sawa astronomers.Mnaona kama ng’ombe @uwesmake inaeza jua hizi vitu.

For something that tapers off, how do we decide whether it has tapered off enough if we don’t have a rigorous definition? Coz they can always observe farther stars.

Ngonja expert astronomers of ktalk wafike kwa hi thread yako ikojolewe mbio.

Yeah considering we have several galaxies, we might have several earths.

Nibiru & Nemesis are somewhere there.

Play Mass Effect 1&2 to get a better understanding of space

Cant wait to hear that a new earth with humans exists somewhere out there

Pia mimi najiuliza hivo. Admin should vet us to ensure such idiots go back to 2go where they belong

Do you think they’d believe in Jesus, Moses and Mohammad?

Nibiru is here

Hapo hamjaambia ango vizuri warai…wacha afunge shift kwft anakuja :D:D:D

This is a great article tunafaa tukuwe na section ya science and technology

Kama kiuna alien momos ndio

figments of imaginations?:D:D:D:D:D:D

What if the Milky Way is just one of God’s body Cells? How Big is God?


If they are as corrupt as Kenyans, they their will come and hide their loot here.