Stargazers in Scotland noticed an unusual change in the skies, labelled Steve.
It can be more aptly defined as a Strong Thermal Emission Velocity Enhancement and was noticed during the night, coinciding displays of the Aurora Borealis.
Funded by Nasa with their citizen science project which sought to capture the aurora, astronomers are striving to make sense of it's appearance.
The aurora was witnessed from the isles of Lewis and Skye.
Also reportedly identifying Steve, were star-gazers from Gairloch in Wester Ross and Oban in Argyll.
Known as the Northern Lights, the aurora borealis was recognized even from more distant locations including Caithness, Aberdeenshire and Shetland.
Situated east-west, Nasa remarks on Steve as being a considerably thin arc that stretches for hundreds or thousands of miles.
On the whole, it largely radiates light in purple hues and can remain for up to an hour, frequently alongside "a rapidly evolving green picket fence-like" aurora.
Nasa's adoption of the title "Steve" to name the phenomenon is in homage to the 2006 children's film Over the Hedge, wherein the name is given to an animal they had never before witnessed.