Set 23C (Earth Science)

they orbit the sun

they are spherical

they do not have any moons

they CAN share their orbits with other bodies of significant size

They have a circular orbit (not any elliptical orbit)

1. Pluto has an orbit that is much more elliptical than the planets.

Pluto sometimes has an orbit that is closer than Neptune's orbit

Pluto has a moon that is the same size as it is

Pluto is the only planet named after an Assyrian god

1. Asteroids - the size can vary from about the size of a house to ⅓ size of the moon

1. Made of solid rock, gravel, and dust.   

1. Some have small satellites of their own. 

1. Most orbit between Earth and Venus

1. can vary from about the size of a moon to ⅓ size of the sun are

1. and causes the tail formation

and cause the tail to always point away from the sun

and cause small asteroids to break off of the comet

1. meteoroids that has entered the atmosphere

meteors that have reached the Earth’s surface

1. ize from dust particles to a small house