Scientists may have narrowed down the landing site of the Soviet Union's Luna 9, which in 1966 became the first spacecraft to touch down softly on the moon.
Everybody knows that galaxies are large structures made of stars. That's a simple definition, and ignores the fact that galaxies also contain gas, dust, planets, moons, comets, asteroids, etc., and of course, dark matter. But one type of galaxy is mostly made of dark matter, and they're difficult to detect.

