Some of the most interesting objects in the constellation Ophiuchus look like dark holes in the sky. Instead, they are immense clouds of cold gas and dust. They absorb the light of the stars behind them, so they look almost black.
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Some of the most interesting objects in the constellation Ophiuchus look like dark holes in the sky. Instead, they are immense clouds of cold gas and dust. They absorb the light of the stars behind them, so they look almost black.