December 13, 2013
From 2013: The Year in Volcanic Activity, one of 36 photos. Mt. Etna, Europe’s most active volcano, spews lava during an eruption as seen from Acireale, near the Sicilian town of Catania, Italy, on November 16, 2013. (AP Photo/Carmelo Imbesi)

From 2013: The Year in Volcanic Activity, one of 36 photos. Mt. Etna, Europe’s most active volcano, spews lava during an eruption as seen from Acireale, near the Sicilian town of Catania, Italy, on November 16, 2013. (AP Photo/Carmelo Imbesi)

December 11, 2013
From 2013: The Year in Photos, September - December, one of 40 photos in this essay, part 3 of a 3-part summary of 2013. Miles Scott, dressed as Batkid, walks with Batman before saving a damsel in distress in San Francisco, on November 15, 2013. San Francisco turned into Gotham City on that day, as city officials helped fulfill Scott’s wish to be “Batkid.” Scott, a leukemia patient from Tulelake in Northern California, was called into service on Friday morning by San Francisco Police Chief Greg Suhr to help fight crime, The Greater Bay Area Make-A-Wish Foundation said. (AP Photo/Jeff Chiu)

From 2013: The Year in Photos, September - December, one of 40 photos in this essay, part 3 of a 3-part summary of 2013. Miles Scott, dressed as Batkid, walks with Batman before saving a damsel in distress in San Francisco, on November 15, 2013. San Francisco turned into Gotham City on that day, as city officials helped fulfill Scott’s wish to be “Batkid.” Scott, a leukemia patient from Tulelake in Northern California, was called into service on Friday morning by San Francisco Police Chief Greg Suhr to help fight crime, The Greater Bay Area Make-A-Wish Foundation said. (AP Photo/Jeff Chiu)

December 10, 2013
From 2013: The Year in Photos, May - August, one of 40 photos in this essay, part 2 of a 3-part summary of 2013. In a natural color mosaic, Saturn eclipses the Sun as seen by NASA’s Cassini spacecraft on July 19, 2013. This image spans about 404,880 miles (651,591 km) across. Earth is barely visible as a single pixel just below the main rings, and to the right of the planet. At this point, Cassini was looking back from more than 898 million miles (1.5 billion km) away from Earth. (AP Photo/NASA/JPL-Caltech/SSI)

From 2013: The Year in Photos, May - August, one of 40 photos in this essay, part 2 of a 3-part summary of 2013. In a natural color mosaic, Saturn eclipses the Sun as seen by NASA’s Cassini spacecraft on July 19, 2013. This image spans about 404,880 miles (651,591 km) across. Earth is barely visible as a single pixel just below the main rings, and to the right of the planet. At this point, Cassini was looking back from more than 898 million miles (1.5 billion km) away from Earth. (AP Photo/NASA/JPL-Caltech/SSI)

December 9, 2013
From 2013: The Year in Photos, January - April, one of 40 photos in this essay, part 1 of a 3-part photo summary of 2013. Here, a truck is covered in ice as firefighters work to extinguish a massive blaze at a vacant warehouse in Chicago, Illinois, on January 23, 2013. More than 200 firefighters battled the five-alarm fire as temperatures were in the single digits. (Scott Olson/Getty Images)

From 2013: The Year in Photos, January - April, one of 40 photos in this essay, part 1 of a 3-part photo summary of 2013. Here, a truck is covered in ice as firefighters work to extinguish a massive blaze at a vacant warehouse in Chicago, Illinois, on January 23, 2013. More than 200 firefighters battled the five-alarm fire as temperatures were in the single digits. (Scott Olson/Getty Images)

December 14, 2012
From 2012: The Year in Volcanic Activity, one of 39 photos. On March 11, 2012, photographer Andrew Hall captured this fantastic image of Santiaguito, an active lava dome on Guatemala’s Santa María Volcano. Hall: “In the middle of the night, restless in my tent after hiking to the top of Volcan Santa Maria with Quetzaltrekkers, I trudged over to the other side of the summit, wrapped myself in my sleeping bag to fight off the chill at 12,000 feet, and watched alone as Volcan Santiaguito erupted again and again over the hours leading up to sunrise. The town of Retalhuleu, just beginning to awake, lies roughly 15 mi beyond.” (© Andrew Hall)

From 2012: The Year in Volcanic Activity, one of 39 photos. On March 11, 2012, photographer Andrew Hall captured this fantastic image of Santiaguito, an active lava dome on Guatemala’s Santa María Volcano. Hall: “In the middle of the night, restless in my tent after hiking to the top of Volcan Santa Maria with Quetzaltrekkers, I trudged over to the other side of the summit, wrapped myself in my sleeping bag to fight off the chill at 12,000 feet, and watched alone as Volcan Santiaguito erupted again and again over the hours leading up to sunrise. The town of Retalhuleu, just beginning to awake, lies roughly 15 mi beyond.” (© Andrew Hall)

December 6, 2012
From 2012: The Year in Photos, Part 3 of 3, one of 45 photos. President Barack Obama hugs his wife Michelle, after she introduces him at a campaign event at the Village of East Davenport in Davenport, Iowa, on August 15, 2012. In November, this image was attached to a short message sent by Barack Obama’s Twitter account, after his re-election became certain, saying simply “Four more years.” The image quickly became the most re-tweeted photo in Twitter’s history. (Scout Tufankjian/Obama for America)

From 2012: The Year in Photos, Part 3 of 3, one of 45 photos. President Barack Obama hugs his wife Michelle, after she introduces him at a campaign event at the Village of East Davenport in Davenport, Iowa, on August 15, 2012. In November, this image was attached to a short message sent by Barack Obama’s Twitter account, after his re-election became certain, saying simply “Four more years.” The image quickly became the most re-tweeted photo in Twitter’s history. (Scout Tufankjian/Obama for America)

December 5, 2012
From 2012: The Year in Photos, Part 2 of 3, one of 45 photos. U.S. gymnast Gabrielle Douglas performs on the balance beam during the artistic gymnastics women’s individual all-around competition at the 2012 London Summer Olympics, on Thursday, August 2, 2012. (AP Photo/Gregory Bull)

From 2012: The Year in Photos, Part 2 of 3
, one of 45 photos. U.S. gymnast Gabrielle Douglas performs on the balance beam during the artistic gymnastics women’s individual all-around competition at the 2012 London Summer Olympics, on Thursday, August 2, 2012. (AP Photo/Gregory Bull)

December 4, 2012
From 2012: The Year in Photos, Part 1 of 3, one of 45 photos. The Costa Concordia, seen on January 14, 2012, after the cruise ship ran aground and keeled over off the Isola del Giglio. 32 passengers and crew members were killed after the Italian ship with some 4,200 people on board ran aground. The Costa Concordia was on a trip around the Mediterranean when it apparently hit a reef near the island of Giglio on Friday, only a few hours into its voyage, as passengers were sitting down for dinner. Captain Francesco Schettino, who reportedly abandoned the ship shortly after it sank, lost his job and still potentially faces manslaughter charges. (Filippo Monteforte/AFP/Getty Images)

From 2012: The Year in Photos, Part 1 of 3, one of 45 photos. The Costa Concordia, seen on January 14, 2012, after the cruise ship ran aground and keeled over off the Isola del Giglio. 32 passengers and crew members were killed after the Italian ship with some 4,200 people on board ran aground. The Costa Concordia was on a trip around the Mediterranean when it apparently hit a reef near the island of Giglio on Friday, only a few hours into its voyage, as passengers were sitting down for dinner. Captain Francesco Schettino, who reportedly abandoned the ship shortly after it sank, lost his job and still potentially faces manslaughter charges. (Filippo Monteforte/AFP/Getty Images)