Here's a video created by astronaut Don Petiit aboard the International Space Station. It's a series of still photos of the Aurora taken from the vantage point of the High Frontier. Notice how thin our envelope of atmosphere is......humbling a little.
Here's the vid
Astronomers Only Knew of a Single Binary Cepheid System. Now They Just
Found Nine More
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Measuring the distance to far away objects in space can be tricky. We don’t
even know the precise distance to even our closest neighbors in the
Universe ...
57 minutes ago
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