Tag Archives: hypothesis

  It used to be easy to know how many planets there were: nine. It had been nine planets for an entire generation before scientists started rethinking what counts as a planet. Pluto is out, but some astronomers believe there’s a real ninth planet lurking out there. Others aren’t convinced, …

It was the power of the eyes — not the limbs — that first led our ancient aquatic ancestors to make the leap from water to land, according to a team of scientists led by Northwestern University Professor Malcolm MacIver and Lars Schmitz of Claremont McKenna, Scripps and Pitzer Colleges. …