Oumuamua: Asteroid that flew past Earth could have been a spacecraft sailing past us, Harvard scientists suggest
"A more exotic scenario is that 'Oumuamua' may be a fully operational probe sent intentionally to Earth vicinity by an alien civilization"
Photos from Japanese space rovers show asteroid is…rocky (photos)
The Japan Aerospace Exploration Agency posted the latest photos on its website
A Japanese probe is about to drop two hopping robots onto asteroid Ryugu
But, Hayabusa2 isn't the only asteroid-sampling mission operating right now
