Welcome to the best daily space questions on this or any other planet!
HOW TO PLAY: Remember to answer by saying just the number 1, 2 or 3, or say Repeat to hear a question again. That's it.
There's a new question every day, written with care by an experienced space nerd so you'll always learn something wonderful about spaceflight, astronomy or the latest cosmic discoveries.
TO THE STARS: Cosmic Question is a spare time labour of love and it's only just left the launch-pad. Please spread the word, or even leave a review, to help fuel its journey to greater heights.
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