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Space Image of the Day Gallery (September 2015)

Night Boat To Cairo

NASA

Tuesday, Sept. 29, 2015: NASA astronaut Scott Kelly photographed the Nile River from the International Space Station on Sept. 22, 2015. On Twitter he wrote: "Day 179. The #Nile at night is a beautiful sight for these sore eyes. Good night from @space_station! #YearInSpace."

— Tom Chao

Halos

Canada-France-Hawaii Telescope/Coelum

Wednesday, Sept. 30, 2015: Two galaxies, NGC 4302-4298, interact as their gravitational fields pull at each other. The disturbed extended stellar halos of these two similar galaxies reveal the tidal interaction. We see one galaxy edge-on, with a dust lane showing the thin galactic disk of younger stars. The other galaxy shows the same central structure as a blue swirl. Image released September 2015.

— Tom Chao

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