16 julio 2015
Back in 1930, it was an easy answer — Pluto was a planet because we couldn’t see anything else brighter at a similar distance away from us, says a cosmologist. Then, in the 1990s, astronomers began detecting more and more planet-like objects around Pluto and the questions started — was Pluto a planet or not?img src=»http://feeds.feedburner.com/~r/sciencedaily/~4/oaH3vWvX4Qw» height=»1″ width=»1″ alt=»»/
http://feeds.sciencedaily.com/~r/sciencedaily/~3/oaH3vWvX4Qw/150716112252.htm
