A team of astronomers has made, thanks to NASA's Chandra X-ray Observatory, an unprecedented measurement of a black hole's spin, one of the two fundamental properties of black holes.
This spacecraft will test a unique elliptical lunar orbit, 1,600 km from one lunar pole on its close pass and 70,000 km from the other every seven days.
Danni Büchner is invited to Sam Dylan's Halloween party. But the "Goodbye Germany" emigrant has no desire for many other party guests. And find clear words.