So what shape is the Milky Way really? ⬇️
, astronomers have now charted our galaxy in 3D on a larger scale than ever before, a new study finds.The Milky Way is acomprised of a bar-shaped core region surrounded by a flat disk of gas, dust and stars about 120,000 light-years wide. Our solar system is located about 27,000 light-years from the galactic center within one of the disk's four spiral arms. One light-year is the distance light travels in a year: about 6 trillion miles .
After comparing a Cepheid's intrinsic brightness to its apparent brightness — that is, how bright it appears from Earth — astronomers can then estimate the Cepheid's distance from our planet, given the knowledge that stars appear dimmer the farther away they are from us. Scientists can determine the distances to Cepheids with an accuracy better than 5%.This image compares a simulation of the Milky Way galaxy's Cepheid star variables with actual observations of their numbers .
. Specifically, the galaxy's disk is not flat at distances greater than 25,000 light-years from the galactic core, but warped. This warping was potentially caused by the galaxy's interactions with satellite galaxies, intergalactic gas or dark matter. Astronomers can deduce the age of Cepheids based on their patterns of pulsations. They found clusters of Cepheids with very similar ages.
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