useless trivia: What Word Means: Supplies With A Heel - Plural Of Heel?

Questions

A heavenly body moving under the attraction of the Sun and consisting of a nucleus and a tail is a(n) ?

From 1979 until 2000 the most distant planet from the earth was ?

How many planets are there in our solar system?

If you're in the northern hemisphere, Polaris, the North Star, can be found by looking which direction?

Name the largest planet in the solar system?