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 [email protected].

To manage podcast ad preferences, review the links below:

See pcm.adswizz.com for information about our collection and use of personal data for sponsorship and to manage your podcast sponsorship preferences.

Learn more about sponsor message choices: podcastchoices.com/adchoices

NPR Privacy Policy