Did you know that the phrase "once-in-a-blue-moon" actually refers to a real event? Blue moons are when we have two full moons in one month, but the moon isn't actually blue. The reason we have blue moons is that our months are usually between 30-31 days (unless we're talking about February, then that's 28-29 days) but the moon goes from new moon to full moon back to new moon in 29.5 days. That means that every couple years, we get a blue moon because two full moons happen in one month. For more cool science facts like this, check back often on the Science Blurbs blog!
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