A rare lunar event that turns Earth's moon blood red is set to grace the Australian sky on Tuesday night.
It may be the last time you can view the spectacular sight for another three years.
A blood moon occurs when the sun, Earth and moon align in a perfect way, causing the moon to pass into Earth's shadow.
According to Sydney Observatory, a lunar eclipse is when the 'moon moves into the shadow of the Earth'.
The moon turns into a reddish hue because the red light from the sun is bent, or refracted, by the Earth's atmosphere onto the moon.
How dark it appears depends on atmospheric* conditions at the time.
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