'Phases' of Martian Moon Phobos Captured by Spacecraft

See the 'phase angles' of the Martian moon Phobos in this time-lapse of images captured by ESA's Mars Express orbiter. - Facts About the Doomed Martian Moon: https://www.space.com/20346-phobos-moon.html

Credit: Space.com / footage courtesy: ESA/DLR/FU Berlin, CC BY-SA 3.0 IGO / produced & edited by Steve Spaleta (http://www.twitter.com/stevespaleta)