Section 2 - Celestial Bodies Quiz Review

A _____________ is an object that orbits the sun, has a spherical shape, but can't clear its orbit.

• planet

• moon

• asteroid

• dwarf planet

A _________ is a large spherical object that orbits a planet.

• moon

• asteroid

• planet

• dwarf planet

________ are outer-space "snowballs" that melt as it gets closer to the sun.

• meteoroids

• comets

• meteors

• stars

_______ is a space object that is traveling through earth's atmosphere (also known as a shooting star).

• comet

• meteor

• meteoroid

• meteorite

________ is a large object that orbits the sun, is spherical shaped, and is dominant enough to clear its own orbit.

• dwarf planet

• asteroid

• moon

• planet

_______ is an airless, rocky world that orbits the sun and can be irregular shaped.

• planet

• dwarf planet

• asteroid

• comet

_______ are small chunks of rock and space junk that have not entered a planet's atmosphere yet.

• meteor

• meteorite

• meteoroid

• comet

_______ is a space object that reaches earth's ground and survives impact.

• meteor

• meteoroid

• meteorite

• asteroid

Why was Pluto demoted from a planet to a dwarf planet?

• it was not spherical shaped

• it was not the dominant body in its orbit

• it does not orbit a star

• it is not warm enough

In what year was Pluto downgraded from a planet to a dwarf planet?

• 2000

• 2003

• 2006

• 2009