Pluto and the Definition of a Planet

What was Pluto originally considered in the solar system?

• A star

• A comet

• An asteroid

• A planet

What did ancient people do to entertain themselves at night?

• Listen to music

• Watch plays

• Read books

• Observe the night sky

What did the ancient Greeks call the planets?

• Moons

• Comets

• Stars

• Wanderers

Which planet was discovered by Sir William Herschel in 1781?

• Neptune

• Uranus

• Pluto

• Saturn

Which planet was mistakenly identified as a star by Galileo?

• Pluto

• Mars

• Neptune

• Uranus

What was the main reason for reclassifying Pluto as a dwarf planet?

• It was too far from the sun

• It was not spherical

• It did not clear its orbit

• It was too cold

What is one of the criteria for an object to be considered a planet?

• It must orbit the sun

• It must be the largest in its orbit

• It must have rings

• It must have moons

How many planets are currently in our solar system after Pluto's reclassification?

• Ten

• Nine

• Seven

• Eight

Which of the following is NOT a dwarf planet?

• Haumea

• Jupiter

• Eris

• Ceres

What did the redefinition of a planet in 2006 lead to?

• Reclassification of Pluto

• Discovery of new planets

• Pluto becoming a star

• Increased number of planets