A Blue Moon is officially projected to be visible on Friday - here are the details on when you can view the phenomenon.

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You'll be able to view the Blue Moon on the East Coast at 6:42 a.m., which is when the moon will reach its full phase. Other coasts will be able to see the blue moon as it sets in the morning.

This is the only blue moon of 2015, so be sure to check it out while you can. For those who miss it in the morning, you can view it again at 8:10 p.m.

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While the Blue Moon phenomenon can make it appear true blue, the Friday one will apparently be a light gray. Volcanoes are the cause of what makes a blue moon actually appear as blue.

"A truly-blue Moon usually requires a volcanic eruption," says NASA. "Back in 1883, for example, people saw blue moons almost every night after the Indonesian volcano Krakatoa exploded with the force of a 100-megaton nuclear bomb. Plumes of ash rose to the very top of Earth's atmosphere, and the Moon ... it turned blue!"

There is a possibility that the Blue Moon will appear as red instead.

"Often, when the Moon is hanging low, it looks red for the same reason that sunsets are red," NASA explains. "The atmosphere is full of aerosols much smaller than the ones injected by volcanoes. These aerosols scatter blue light, while leaving the red behind."

Be sure to check out the Blue Moon on Friday, as it is the only one that will occur in 2015.

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