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The expansion of our universe may be slowing down. What does that mean for dark energy?
As if dark energy weren't already mysterious and baffling enough, new research suggests that this unknown force may not be ...
Interstellar object 3I/ATLAS is expected to reach its perihelion, or the closest point to the Sun in its highly eccentric ...
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No One Actually Knows What a Moon Is
The universe has quasi-moons, mini-moons, and moonlets, but no official definition of what counts as a moon.
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