Planet's Article

The planetary system we call home

• Milky Way Galaxy

• The Big Dipper

• Earth

• solar system

Which planet do humans inhabit?

• Neptune

• Moon

• Earth

• Mars

Everything is bound by:

• stars

• moon

• gravity

• energy

Scientist believe there are _________galaxies in the universe.

• hundreds

• thousands

• millions

• billions

Our system has how many planets?

• 9

• 1

• 8

• 10

The solar system also includes ________ belt

• Pluto

• Kuiper

• Neptune

• Mars

Both Pluto and _______ were once considered planets.

• Ceres

• Moon

• Mars

• Sun

Which is not a requirement of a planet?

• It must orbit a star (in our cosmic neighborhood, the Sun).

• It must be big enough to have enough gravity to force it into a spherical shape.

• It must have at least 5 moons

• It must be big enough that its gravity cleared away any other objects of a similar size near its orbit around the Sun.

There are more than _______ known moons in our solar system

• 300

• 100

• 400

• 150

Which two planets have no moons?

• Earth and Neptune

• Mercury and Venus

• Neptune and Jupiter

• Mercury and Mars