2013's top 20 images of planet Earth

Which of the following 20 images do you think is the best of the year?  (DigitalGlobe)

Jan. 6, 2013: Fires are seen in a false-color image of Dunalley, Australia (red = healthy vegetation). (DigitalGlobe)

May 26, 2013: The Citadel of Aleppo, a medieval fortified palace in Syria. (DigitalGlobe)

April 22, 2013: It's not a snake! It's the Colorado River in Utah, seen from the skies. (DigitalGlobe)

Aug. 20, 2013: The Palace of Versailles in France, looking for all the world like a soldier itself. (DigitalGlobe)

April 22, 2013: Australia's Great Barrier Reef stands out against the blue ocean. (DigitalGlobe)

Feb. 19 2013: The volatile Mount Vesuvius, in Naples, Italy. (DigitalGlobe)

March 17, 2013: Site of the 2014 Winter Olympics: Sochi, Russia. (DigitalGlobe)

April 28, 2013: The massive Cambambe Dam, on the Cuanza River in Angola. (DigitalGlobe)

May 13, 2013: The Sossusvlie area of the Namib Desert, Namibia, looks practically inviting from miles overhead. (DigitalGlobe)

Feb. 16, 2013: Galenjak -- the Island of Love -- in Croatia. (DigitalGlobe)

May 9, 2013: A giant rubber duck sits in the harbor in Hong Kong, China. (DigitalGlobe)

March 22, 2013: Manam Volcano rumbles and steams in Madang Province, Papua New Guinea. (DigitalGlobe)

Feb. 13, 2013: Arlit Uranium Mine in Niger, Africa. (DigitalGlobe)

May 26, 2013: Schooner Cays, Bahamas. (DigitalGlobe)

March 4, 2013: An artificial island spanning nearly four million sq meters in Doha, Qatar. (DigitalGlobe)

July 19, 2013: Palau de les Arts Reina Sofia and Gulliver Park with an enormous fiberglass model of Lemuel Gulliver trapped in Valencia, Spain. (DigitalGlobe)

Feb. 13, 2013: A massive "green tide" seen near the city of Sur, Oman. (DigitalGlobe)

Sept. 29, 2013: This new island was created by an earthquake in Pakistan -- it sits just off the Gwadar coast. (DigitalGlobe)

Nov. 3, 2013: "Wish," a large-scale art work in Belfast, Northern Ireland. (DigitalGlobe)

Sept. 24, 2013: Shiyuan Park in Xian, China. (DigitalGlobe)