A ________ is a group of stars, any planets that orbit them, and the moons that orbit the planets.

A planet's __________________ helps keep it warm by trapping heat from the sun.

The Kuiper Belt is a really cold area at the edge of our Solar System. It is full of ____________.

The inner planets in our Solar System are made of _______

A(n) ___________ is approximately 5 trillion miles.

A(n) _______________ is the distance between Earth and the sun, approximately 93 million miles.

Which unit(s) do scientists use to measure distance in space?

What kind(s) of lightwaves can land-based telescopes detect?

What kind(s) of lightwaves can space-based telescopes detect?

When the distance between 2 objects increases, the force of gravity between them ___________.

When 2 objects are different sizes, the force of gravity between them has a much stronger effect on the _________ object because less force is required to move _________ objects.

We experience ____________ because of the way that Earth is tilted on its axis as it orbits the sun.

Temperatures are warmer in places where the sun shines ___________ on the Earth.

We experience summer when the Northern Hemisphere is tilted ______________ the sun.

The right side of the moon is lit up during these phases (check all that apply)

The left side of the moon is lit up during these phases (check all that apply)

In which phases is MORE THAN half of the moon lit up? (Check all that apply.)

In which phases is LESS THAN half of the moon lit up? (Check all that apply.)