How are all the planets in the solar system similar?

Answer 1

No - the moons in my solar system are not similar in appearance. Most are spherical (if the are big enough) but some, like the 2 moons of Mars, are more potato shaped, since they are not big enough to have enough gravity to form spheres.

Answer 2

They all travel around the Sun, in orbits which are more or less elliptical. They are all roughly spherical. By the new definition, they are all sufficiently massive to have cleared their orbits of other objects (excepting their moons).

Answer 3

They're both massive bodies of matter which orbit other, more massive celestial bodies.

Answer 4

well, all of the planets in the solar system have mass, and they all orbit the sun

Answer 5

They all rotate around the sun.