21-22 Review - Objects in our Solar System

Which two telescopes are considered 'optical'?

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

Which nation launched the first space station?

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

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

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

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

A planet that is made of lighter elements which are gases is-

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

_____ describe how the planets move and behave.

There are four terrestrial planets. They are-

What is the smallest planet in our Solar System?

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

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

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

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

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

What distinguishes Earth from other planets in our Solar System?

What is an astronomical unit?

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