Astronomy Picture of the Day

Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer.

2012 July 8
See Explanation. Clicking on the picture will download the highest resolution version available.

Volcano and Aurora in Iceland
Image Credit & Copyright: Sigurdur H. Stefnisson

Explanation: Sometimes both heaven and Earth erupt. In Iceland in 1991, the volcano Hekla erupted at the same time that aurorae were visible overhead. Hekla, one of the most famous volcanoes in the world, has erupted at least 20 times over the past millennium, sometimes causing great destruction. The last eruption occurred only twelve years ago but caused only minor damage. The green auroral band occurred fortuitously about 100 kilometres above the erupting lava. Is Earth the Solar System's only planet with both aurorae and volcanos?

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