The following is a terrestrial chronology charting the arrival of Galactic superwaves, cosmic dust incursions, extreme solar events, and glacier wave flood events during the past 67,000 years. It is divided in two parts, 67 kyrs BP to 19 kyrs BP and 19 kyrs BP to the present. All dates have been converted to the Cariaco Basin radiocarbon dated varve chronology published by Hughen (2006). References given in column 3 of the tables are given below.
When the Event Horizon Telescope Collaboration said they would release their first image of Sgr A* on April 15th, instead, close to this date, they announced an image of M87 that was a rework of an image published two years earlier. Still to this date, they have not released an image of Sgr A*. The core of M87 is 1550 times more massive than the core of our galaxy, hence would be 1550 times more distorted due to gravitational warping.