The Solar System

How many years ago was the solar system formed?

• 4.5 million

• 4.5 billion

• 45 billion

What are Mercury, Venus, Earth and Mars?

• Terrestrial planets

• Gas giants

• Moons

Which planet’s the smallest?

• 
• 
• 

Which planet’s the hottest?

• Mars

• Saturn

• Venus

How many moons are there in the solar system?

• at least 50

• at least 100

• at least 150

Which planets have no moons?

• Mercury and Venus

• Saturn and Uranus

• Mars and Neptune

Who was the first human to travel in space?

• Yuri Gagarin

• Neil Armstrong

• Buzz Aldrin

In what year did Neil Armstrong and Buzz Aldrin land on the moon?

• 1961

• 1969

• 1989