What is a 'black moon', and how often does one happen?

Find out what this lunar event really means, and why it's actually impossible to see a black moon rising.
Find out what this lunar event really means, and why it's actually impossible to see a black moon rising.
What is the moon made of, and how did it form? Learn about the moon's violent origins, how its phases shaped the earliest calendars, and how humans first explored Earth's only natural satellite half a century ago.

What is a 'black moon', and how often does one happen?

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