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John

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3	Can some stars not emit any energy in the visible spectrum?
2	How does gravity have an effect from the inside the event horizon of a black hole with the rest of the universe?
0	Why black holes have positive energy?

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3 light	3 spectroscopy
3 space	2 black-hole × 2
3 fundamental-astronomy	2 gravity × 2

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Chinese Language	111 rep	1 bronze badge

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