: In July, NASA’s New Horizons spacecraft completed its historic flyby of Pluto, sending back the first high-resolution images of the "dwarf planet" and its moons, captivating the world's imagination. Social and Cultural Milestones

: In December, nearly every nation on Earth signed the Paris Agreement , a historic climate accord aimed at limiting global warming to well below 2 degrees Celsius.

The year was also defined by significant social progress and shifts in public consciousness.

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: In July, NASA’s New Horizons spacecraft completed its historic flyby of Pluto, sending back the first high-resolution images of the "dwarf planet" and its moons, captivating the world's imagination. Social and Cultural Milestones

: In December, nearly every nation on Earth signed the Paris Agreement , a historic climate accord aimed at limiting global warming to well below 2 degrees Celsius. : In July, NASA’s New Horizons spacecraft completed

The year was also defined by significant social progress and shifts in public consciousness. : In July