RIDDLE: Christmas...

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It's christmas and the astronaut is called to visit the space once again, leaving the family behind, celebrating without him. His mother feels bad (as a mother) that her son is going to miss the most important celebration of the year and she prepares special cakes that have sugar powder on them. The astronaut takes the box with the small cakes and enters the spaceship. They take off and when they reach the space, the astronaut feeling lonely, decides to eat his cakes. Why the sugar powder doesn't fall off the cakes? This was a question that we had to answer in a Physics test at school.