Milky Way was blasted: dark impactor

"dark impactor"

Gathering data from the Gaia satellite, it appears very much that the Milky Way galaxy had something big blast its way through one of its big arms. Something big, like 30-65 light years across, a million times the mass of the sun like a globular cluster but not visible according to Ana Bonaca ,"a dark impactor".  She made a report on April 15, 2019 at the American Physical Society in Denver. The report is carried by several outlet sources. Ana Bonaca has been studying clusters of stars and galaxies from various developments. She works at Harvard -Smithson Center for Astrophysics