Using an "organ-on-a-chip" device, scientists have found that heart tissues beat half as strongly on the International Space Station as they do on Earth.

One evening a stranger appears at Liz's doorway, whisking her away to a colorful world that lies deep within the center of the Earth. Not only is it controlled by a powerful tyrant, but the very ...

Of course, Gaia-BH3 is a small fry compared to the supermassive black hole that dominates the heart of the Milky Way, Sagittarius A* (Sgr A*), which has a mass 4.2 million times that of the sun.