What is a dirty snowball?
comets
What is it composed of?
dust, stones, and ice
Where do they travel?
around the su
Does something else travel around the sun?
planets
How are they different than comets?
made of solid rocks
Do all comets make just one trip around the sun?
yes
Why do some comets only go around once?
They have been captured by the sun
What is Halley?
comet
When was Halley first seen?
3,000 years ago
How long will it be around?
another 3,000 years