nearer to the sun.Of these planets,Mercury is the closest to the sun;Venus
including the Earth,are basically balls of rock.Mercury is the smallest in size.
Mars is larger than Mercury,but its diameter is only a little more than half
that of the Earth.Venus,with a diameter of roughly 7,600 miles
(12,000 kms),is almost as large as the Earth.
Four of the five outer planets are much bigger than any of the inner
the inner planets.
Its composition is also a mystery.All that is known for sure about Pluto is
its orbit.Pluto’s average distance from the sun is almost 40 times that of the Earth.
in science projects.(i got an A+).