The most recent Chandra press and image release “NASA’s Chandra Finds Galaxy Cluster Collision on a “Whim” was release on 10/13/22. Astronomers taking inventory of the material in the local universe keep coming up short. A new result from NASA’s Chandra X-ray Observatory about a system of colliding galaxy clusters may help explain this shortfall. Although scientists know a great deal about the composition of the universe, there has been a vexing problem they have struggled to explain — there is a significant amount of matter that has not yet been accounted for. This missing mass is not the invisible dark matter, which makes up majority of the matter in the universe. This is a separate puzzle where about a third of the “normal” matter that was created in the first billion years or so after the big bang has yet to be detected by observations of the local universe, that is, in regions less than a few billion light-years from Earth. This matter is made up of hydrogen, helium, and other elements and makes up objects like stars, planets, and humans.
For more information: NASA's Chandra Finds Galaxy Cluster Collision on a "Whim"
