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Planet X is first discoverd by Clyde Tombaugh
"Timeline - Title 1." Timeline - Title 1. Timelines. Web. 19 Dec. 2013. http://timelinesdb.com/listevents.php?subjid=867. -
Period: to
Pluto
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Pluto is publicly announced as a new planet
"Timeline - Title 1." Timeline - Title 1. Timelines. Web. 19 Dec. 2013. http://timelinesdb.com/listevents.php?subjid=867. -
James Christy finds a new moon
"Timeline - Title 1." Timeline - Title 1. Timelines. Web. 19 Dec. 2013. http://timelinesdb.com/listevents.php?subjid=867. -
The pioneer 10 spacecraft crossed pluto orbit
"Timeline - Title 1." Timeline - Title 1. Timelines. Web. 19 Dec. 2013. http://timelinesdb.com/listevents.php?subjid=867. -
Pluto was reported to have three moons, not one.
"Timeline - Title 1." Timeline - Title 1. Timelines. Web. 19 Dec. 2013. http://timelinesdb.com/listevents.php?subjid=867. -
NASA launched a spacecraft that was headed to pluto and is not expected to get there until 2015
"Timeline - Title 1." Timeline - Title 1. Timelines. Web. 19 Dec. 2013. http://timelinesdb.com/listevents.php?subjid=867.