Secret Sky: An inverse black-drop effect

In some planetary observations, imperfect seeing can be a perfect companion. Let me clarify. Some of the most baffling planetary observations over the past century and more have turned out to be illusions created largely by imperfections in Earth’s atmosphere. While these effects are illusory, observers today enjoy scouting them out. It can be notContinue reading “Secret Sky: An inverse black-drop effect”
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