One of the best time-lapses. Haven't read the paper yet, but here's the dark matter angle:
A Dense Clump Of Dark Matter, Not A Supermassive Black Hole, Could Reside In The Milky Way's Center.
There's been widespread agreement that a supermassive black hole resides in the Milky Way's Center. But that may not be true. Researchers say that a dense clump of fermionic dark matter can also explain the motions of stars and gas clouds in the region. Crucially, it can also explain the famous Event Horizon Telescope image of the SMBH.
Universe Today (www.universetoday.com)