"In The Secret Explorers and the Comet Collision, space expert Roshni leads a mission that's out of this world - literally! With rainforest expert Ollie, she is set the task of fixing the space probe orbiting Jupiter before a comet hits the planet. With the clock ticking, it's a race against time for the Secret Explorers as they dodge asteroids, complete daring spacewalks, and use all their skills to complete their mission."--Amazon.com.

A small comet heads for earth and arrives at the manger where Baby Jesus lies.

It's getting hotter and hotter in Moominvalley, and all the creatures have taken note of the troubling weather. After a mysterious cloud appears in the sky, an exodus begins. When they realize the cloud is a comet, Moomin, Little My, and Snorkmaiden decide to leave home too. Between a tidal wave and a comet-struck Moomin, the end does seem nigh, but the day may yet be saved. The whole family can enjoy Jansson's satire on true concerns about future...

Moomintroll encounters a mouth-organist, a moth collector, and a lovely maiden, and discovers the danger of a threatening comet when he takes a journey to seek advice from the Professor.