Number Of Planets
Date: Prior to 1993
How many known planets are there, inside and outside the solar
system? I have read in Astronomy magazine that at least 2 planets were
discovered around a pulsar (I do not know where) and that perhaps a 10th
planet lies past Pluto. Any more I do not know about?
I have not heard of any good hard evidence for any planets other
than the usual nine.
Update - March 2011
As 2011, there are officially eight planets in our Solar System. Pluto, common thought of as the ninth planet, is officially listed as a dwarf planet. There are many dwaft planets in our solar system, Ceres, Pluto, Haumea, Makemake, and Eris.
There have also been planets discovered outside of our solar system, thoughI do not have a count on them at the present time.
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Update: June 2012