... Tonight's Sky . ... Observing . ... Sky this Month . ... Astronomy for Kids . ... Satellite to study near-Earth asteroids' wobbly signature . ... If a known asteroid passes one of the satellites and doesn't leave a signature, "that allows us to put an upper limit on the mass of that asteroid," Tricarico said. ... Only registered members of Astronomy.com are allowed to comment on this article. ... Receive news, sky-event information, observing tips, and more from Astronomy's weekly email newsletter. ...