Given scientific fact as input, generate the question from this fact such that it can be answered from the input.

Ex Input:
Tornadoes can occur in any.

Ex Output:
At what time of the year can tornadoes occur?


Ex Input:
Solids are categorized by the forces holding the individual atoms, ions, or molecules together.

Ex Output:
What is categorized by the forces holding the individual atoms, ions, or molecules together?


Ex Input:
The tidal forces near black holes are so great they can actually tear matter from a companion star.

Ex Output:
The tidal forces near what celestial phenomena are so great they can actually tear matter from a companion star?