/r/askscience
The rate of universal expansion is accelerating to the point that light from other galaxies will someday never reach us. Is it possible that this has already happened to an extent? Are there things forever out of our view? Do we have any way of really knowing the size of the universe?
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Theoretically if there were 6 black holes making a cube shape that blocked off all entrances and you went into the empty space between the black holes (without getting sucked in) what would happen to space and time around you and outside of the theoretical black hole cube?
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What is the diameter of a lightning? They are always seen like some cm of diameter, but can it be just a diameter at the scale of atoms? Does they get bigger if they have more energy?
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How much erosion does the international space station experience as it moves through the upper atmosphere?
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In 2024 if NASA do get to and land on the moon, will novice photographers or people with telescopes be able to see any of the mission?
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