Night and day images of southern Italy taken by Expedition 40 crewmembers from on board the International Space Station.
The night image was posted by ESA astronaut Alexander Gerst on Twitter with the comment: "You can see the red glowing lava of 2 volcanoes on this photo! Spot them on @astro_reid's day photo! #teamwork"
The day image was posted by NASA astronaut Reid Wiseman who said: "#Etna and #Stromboli erupting by day. @astro_alex took the exact same shot at night, with lava. #teamwork"
Follow the Blue Dot mission via www.esa.int/bluedot
Connect with Alexander Gerst on social media via alexandergerst.esa.int
Follow Reid Wiseman on twitter.com/astro_reid