Kepler-62f is an Earth-size planet in the habitable zone of a star about 1,200 light-years from Earth (artist's rendering).
PHOTOGRAPH COURTESY OF NASA/AMES/JPL-CALTECH
From the edge of the solar wind to ancient human DNA, science made big strides in 2013.
Science mattered more than ever in 2013. Climate science questions raged after Super Typhoon Haiyan pummeled the Philippines. And scientific expertise figured in disarmament debates in Syria and in Iran's proposed halt to its nuclear activities.
Meanwhile, on the pure research front, investigators made plenty of intriguing discoveries in 2013. With plenty to choose from, and argue over, here's a top five list of some favorites from the year: