henrietta leavitt

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Ask Ethan #16: What are Variable Stars?

“To be is to be the value of a variable.” –Willard Van Orman Quine It’s the end of the week once again, and the very end of our Year In Space 2014 Wall Calendar giveaway! So for this week’s Ask Ethan column, after dipping into our question/suggestion box, I’m very pleased to let Vera from…