What is a Planet?

What does NASA stand for?

• Neptune Astromoners Suits Administration

• National Aeronautics and Space Administration

• Nautical Area and Spiral Aeronautics

In what year did NASA define a planet?

• 1986

• 2006

• 2016

Which civilization observed the sky thousands of years ago?

• Egyptians

• Mesopotamians

• Greeks

Early people noticed that the stars didn't move, but the planets...

• wandered

• didn't move also

• collided with one another

How did scientists discover planets orbiting the Sun?

• They read it in books.

• They used telescopes.

• They took classes to find out.

Why were objects in the Keiper Belt not considered planets?

• They were smaller than Pluto.

• They weren't round.

• They were larger then Pluto.

What if Eris was classified as a planet?

• Eris is a planet.

• All other objects would be planets.

• Pluto would not be a planet.

Check the three criteria in order to be classified as a planet.

• A planet must orbit itself

• A planet must be round ball.

• A planet must orbit the Sun.

• A planet must clear its neighborhood.

What is the one criteria Pluto does not meet?

• orbit the Sun

• squash into a round ball

• clear its neighborhood

According to the definition, Pluto is not a planet but a..

• dwarf planet

• small planet

• irregular planet