Space
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What is an astronomical unit (AU)?
Posted · Author Stuart
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What is the density of a neutron star?
Posted · Author Stuart
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How fast are Neptune's winds?
Posted · Author Stuart
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What's the most massive black hole we know of?
Posted · Author Stuart
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How fast does the fastest-spinning neutron star known spin?
Posted · Author Stuart
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How many Stars and Planets does the Milky Way have?
Posted · Author Stuart
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What is black hole time dilation?
Posted · Author Stuart
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How many Earth’s can fit between the Sun and the Heliopause?
Posted · Author Stuart
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Is the Moon slowly moving away from the Earth?
Posted · Author Stuart