3rd Grade Science - Solar System

I am the only planet known to have liquid water on its surface. In fact, almost ¾ of my surface is covered in water. I have a nearly circular orbit. Which planet am I?

Earth

Name the outer planets.

Jupiter, Saturn, Uranus, and Neptune.

Name the largest planet and the smallest planet in our solar system.

Mercury is the smallest. Jupiter is the largest

Name the planets of the solar system in order, starting at the sun.

Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune

Name the inner planets of the solar system.

Mercury, Venus, Earth, and Mars.

What is the memory trick for learning the order of the planets?

My very excellent mother just served us nachos

I used to be considered a planet, but am not any more. My surface is rocky and very cold. What am I?

Pluto

What do telescopes do?

Telescopes magnify the appearance of distant objects in the sky and makes them visible.

What is the major source of energy on Earth?

The Sun

Where is the core of the sun?

The core is in the center of the sun.

What keeps the planets in orbit around the sun.

The force of gravity

Why are Mercury, Venus, Earth, and Mars called inner planets?

They are closest to the sun.

What galaxy is our solar system in?

the Milky Way galaxy