Early risers in the UK will have a chance to see this month's blood moon eclipse, as as a partial lunar eclipse lights up skies across the country.
On the night of the 13-14 March, the moon will undergo a partial eclipse, which will see the surface of our planet's satellite briefly turn darker, with hints of red.
It's also the last full moon of winter.
The blood moon eclipse will be best viewed from North America, but here in the UK we will have a limited time window to see a partial eclipse - roughly between 4am and 7am.
A lunar eclipse happens when the Earth passes between the sun and the moon, totally or partially blocking the light that reaches the moon.
Nasa said: "Lunar eclipses can happen only during a full moon, when the moon and sun are on opposite sides of Earth.
'At that point, the moon can move into the shadow cast by Earth, resulting in a lunar eclipse.'
In a total eclipse the whole moon is in the Earth's shadow, while in a partial eclipse, only part of the moon's surface is in shadow, the rest is in sunlight.
Those in the US will be able to see a total eclipse this week, while in the UK a partial eclipse will be visible.
A blood moon eclipse is not a scientific term, but it refers to the moment during a lunar eclipse where the surface of the moon takes on a reddish colour.
This happens due to a process called Rayleigh scattering, which is the way light scatters when it hits small particles (and is the reason the sky turns red at sunset).
In an eclipse, filtered reddish light from the sun is bent round the Earth and illuminates the moon's surface.
There are two parts of the moon's shadow - the umbra (the darkest part) and the penumbra (which is lighter).
During this eclipse almost all of the moon will be in Earth's umbra - but there's a very limited time to see it.
Royal Museums Greenwich said: "The moon will first move into Earth's penumbra at 3.57am GMT. The maximum of the eclipse in London will be at 6.19am, because during the eclipse's actual maximum at 6.58, the moon will have set below the horizon.
"Getting to a high point with a clear western view will allow you to see more of this eclipse."
The next lunar eclipse will be a total eclipse on 7 September this year.