Inquiries about the moon's twilight zone, and more reader feedback | Science News

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Inquiries about the moon's twilight zone, and more reader feedback

Your letters and comments on the Aug. 5, 2017, issue of Science News

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4:00pm, August 23, 2017

Locked up

Simulations suggest that heat from an infant Earth, the sun and the moon could have vaporized the moon’s metals into a thick atmosphere, Lisa Grossman reported in “Metallic air may have swaddled moon” (SN: 8/5/17, p. 7). One way to test the idea would be to look for a ring of extra sodium in rocks around the moon’s twilight zone, where sodium snow would have accumulated. This zone exists between the moon’s light and dark sides, which result from one side always facing Earth — a circumstance known as tidal locking.

Online reader Idhbk wondered if the early molten moon would have had a consistent face to show

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