17:I[66739,["/_next/static/chunks/0.3dg.jzl0xwf.js?dpl=dpl_ADavNnop8X1LgnurSAwpmKs3ySqi","/_next/static/chunks/05hx6kuf6-oy4.js?dpl=dpl_ADavNnop8X1LgnurSAwpmKs3ySqi","/_next/static/chunks/0e~mn1op2jzz5.js?dpl=dpl_ADavNnop8X1LgnurSAwpmKs3ySqi","/_next/static/chunks/0juapqyy99ga..js?dpl=dpl_ADavNnop8X1LgnurSAwpmKs3ySqi","/_next/static/chunks/09-r7sdqv1jf4.js?dpl=dpl_ADavNnop8X1LgnurSAwpmKs3ySqi","/_next/static/chunks/06dn~uer6.43l.js?dpl=dpl_ADavNnop8X1LgnurSAwpmKs3ySqi"],"default"] 19:I[38632,["/_next/static/chunks/0qqtp3r0h7kah.js?dpl=dpl_ADavNnop8X1LgnurSAwpmKs3ySqi","/_next/static/chunks/0iukvycbd42rl.js?dpl=dpl_ADavNnop8X1LgnurSAwpmKs3ySqi"],"IconMark"] 18:T441,This year, there will be a "blue moon" for Halloween. So for today's show, we're asking: What IS a blue moon? Is the moon ever blue? And are they as rare as the phrase "once in a blue moon" implies?

For additional info and fun links, check out the episode page.

Follow Maddie and Rebecca on Twitter for more science nuggets. Maddie's @maddie_sofia and Rebecca's @rebeccalramirez. Email the show your celestial musings and inquiries. We're at shortwave@npr.org.

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Micro Wave: "Once In A Blue Moon" Is Happening Again This Halloween

Short Wave

Micro Wave: "Once In A Blue Moon" Is Happening Again This Halloween