The findings were published Jan. 22 in the journal Astronomy & Astrophysics. As matter falls into a black hole, it also circles it like water spiraling down a drain.

It wasn't clear whether grey smoke was closer to black or white, for example. By the 1970s, the straw method had been abandoned in favor of more controllable chemical mixtures.

World News Iran’s Arak heavy water reactor revealed in photos after Israel’s punishing airstrikes leave gaping hole By Emily Crane Published June 19, 2025, 1:52 p.m. ET ...

"New insights into black hole scattering and gravitational waves unveiled." ScienceDaily. ScienceDaily, 15 May 2025. <www.sciencedaily.com / releases / 2025 / 05 / 250514111230.htm>.