Science Review - Objects in our Solar System

What is an astronomical unit?

A small, icy object that develops a glowing tail as it nears the Sun.

In ancient times, people believed that all objects in the Universe revolved around the Earth. This was called the...

A _____ is an object that orbits a star, has a round shape, and does not have a debris field.

A small, rocky object that orbits the Sun (mostly between Mars and Jupiter).

_____ describe how the planets move and behave.

What is the smallest planet in our Solar System?

What distinguishes Earth from other planets in our Solar System?

A planet with a solid, inner core is...

A ___ becomes a ___ when it enters Earth's atmosphere.

What was the first human-made object to travel outside our Solar System?

What factors influence the strength of attraction (gravity) between two objects?

Which two telescopes are considered 'optical'?

Which nation launched the first space station?

A planet that is made of lighter elements which are gasses is a...

Who first discovered that the Earth, and all other planets, revolve around the Sun?

Which planet is considered to be Earth's "twin" due to their similar size?

There are four terrestrial planets. They are:

The __________ is made of several parts: the sun, eight planets, and numerous smaller objects that orbit the Sun.

Smaller, planet-like objects, sometimes called protoplanets, with debris fields are called...