Asteroids and comets

What is the main difference between asteroids and comets?

• Their composition

• Their tail

• Their size

• Their orbit/location

What is a planetoid?

• A big asteroid

• An asteroid orbiting a planet

• An asteroid on a collision course with a planet

• An asteroid that was formed out of a piece of a planet

What are Trojan asteroids?

• Asteroids at Lagrange point L4 or L5 of a bigger object in the same orbit around the sun

• Objects in a higher solar orbit than Neptune

• Objects at Lagrange point L2 of a bigger object in the same orbit around the sun

• Objects in an orbit with a perigee of between 2000 and 200000 AU from the sun

Which asteroid type does NOT exist?

• C-type

• M-type

• S-type

• G-type

What was the first ever asteroid to be discovered?

• Ceres

• Pallas

• Juno

• Vesta

About how many known asteroids are there?

• 1000

• 10000

• 100000

• 1000000

What is the biggest asteroid in the main asteroid belt?

• Ceres

• Vesta

• Pallas

• Europa

Which spectral type is ceres?

• C

• S

• M

• P

Who discovered Ceres?

• Galileo Galilei

• Guiseppe Piazzi

• Heinrich Wilhelm Olbers

• Karl Ludwig Harding

How many asteroids were discovered before Neptune?

• 5

• 10

• 15

• 20