Astronomers have snapped the first image of Sagittarius A*, the supermassive black hole at the heart of the Milky Way. “The result is a milestone in our understanding of black holes in general and the one at the center of our galaxy in particular,” says Colin Lonsdale.

MIT has offered military training since 1865. Today, it hosts Air Force, Army, and Naval ROTC programs. “It’s really inspiring to be around a group of people that is so motivating,” says AeroAstro senior and Navy ROTC Midshipman Juliana Silldorff.

This week, members of the three working groups established last year under MIT’s “Fast Forward” climate action plan reported on the work they’ve been doing to meet the plan’s goals, including reaching zero direct carbon emissions by 2026.

Via @MITmedical on Twitter: “During #NursesMonth, we honor MIT Medical’s nursing staff. They deliver high-quality care throughout the year and play a vital leadership role in campus-wide public health initiatives.”

Julie Chen, who holds three MIT degrees, has been named the next chancellor of UMass Lowell. “Chen is considered one of the region’s leading experts in nanotechnology, earning her the nickname ‘nanoqueen,’” the Boston Globe reports.

Before cells start to divide, they tidy up, tossing out molecules they may not need anymore. Cells lose about 4 percent of their mass at this stage, which may help give their offspring a “fresh start,” without accumulated junk from the parent cell.