DON'T be alarmed if the moon looks a little different later this month.

A unique glow will illuminate the sky in the shape of the Super Blue-Blood Moon on Wednesday, January 31.

A Blue Moon can be seen when two full moons (or super moons) occur in the same calendar month. The last super moon happened on January 1st. Blue Moons only happen every two and a half years on average.

Coincidentally, on the same night there will be a total lunar eclipse, which happens when the moon passes into the Earth’s shadow. This means that the Super Blue Moon will take on an eerie red glow to become the Super Blue-Blood Moon.

NASA said “the Moon will lose its brightness and take on an eerie, fainter-than-normal glow from the scant sunlight that makes its way through Earth’s atmosphere. [They’re] often cast in a reddish hue because of the way the atmosphere bends the light.”

You’ll want to capture the moment when you get the chance, because it will take until May 18, 2019, for the following Blue Moon to occur.

“Sometimes the celestial rhythms sync up just right to wow us. Heed your calendar reminders,” NASA said.

The super moon will be most visible to those in the UK at around 2am on the night of January 31 and February 1.