FARGO — Our planet Earth is tilted. That is to say, its axis of daily rotation is tilted about 23 and a half degrees from its axis of revolution around the sun. It is this tilt that gives us seasons.

The combination of close approach, brightness and large solar elongation of comet 41P/Tuttle–Giacobini–Kresák (hereafter 41P) made it the target of observations worldwide for several months. We report ...

Forbes contributors publish independent expert analyses and insights. An award-winning reporter writing about stargazing and the night sky. A single rotation of our planet takes 24 hours and ...

James is a published author with multiple pop-history and science books to his name. He specializes in history, space, strange science, and anything out of the ordinary.View full profile James is a ...