Practice problem
(http://news.yahoo.com/hello-pluto-nasa-spacecraft-makes-historic-dwarf-planet-115557846.html)
Why is Pluto now considered to be a dwarf planet?
It does not orbit the sun.
It does not have enough mass so it has not been rounded by its own gravity.
It has not cleared its orbital neighborhood of smaller bodies or does not control its motion through its gravity.
It is too far from the sun.
Type a concept, like “slope” or “photosynthesis”.
