(Image/s: mpie.de all credit due)
Taken with the Wide Field Infrared Survey Explorer (WISE), a distribution of stars which forms an X shape within the bulge of the Milky Way centre.
From: mpie.de (article)
“But when Melissa Ness of the Max Planck Institute for Astronomy saw the tweet, she recognized traces of a structure astronomers had long sought for, but never seen directly in an image: an X-shaped distribution of stars in the central region (“bulge”) of the Milky Way.
Ness and Lang met in person a few weeks later at a conference and began to collaborate, processing the maps to obtain the first clear image of the giant X at the heart of our galaxy. The results have recently been published in the Astronomical Journal.”
For great images via the WISE telescope, please refer to this link: https://www.nasa.gov/mission_pages/WISE/main/index.html