Lesson 6. Whether Pluto is a planet
or just a large rock captured from far out in space by
the Sun's gravity is still a matter for debate among
astronomers.This lesson is about the classification of
a planet and the criteria used to do this. Should Pluto
be classified as a planet according to the criteria?
Working through a series of exercises, pupils are expected
to come to a decision and justify their views using evidence.They
will have an opportunity to think about a variety of
objects in the Solar System; asteroids and comets as
well as planets.