A blood Moon total lunar eclipse is on show in many parts of the world as the Moon passes through Earth's shadow.
Australia will miss out on the eclipse this time, but it will be seen in the Americas, Antarctica, Europe, Africa and the eastern Pacific.
However, Australians will see a blood moon on the night of November 8.
New Zealand, Eastern Europe and the Middle East will experience a penumbral lunar eclipse, where the edge of Earth's shadow will fall over the Moon.
The Old Farmer's Almanac — which publishes Native American names for full Moons — calls it a "flower Moon" because May is known as a month when flowers bloom in abundance.
NASA calls May's full Moon a "marginal supermoon", but there's varying opinion on whether it actually is a supermoon, due to different definitions on what constitutes one.
ABC/wires