Where were you when New Horizons beamed back those first close-up views of Pluto? The historic day-long encounter with a dwarf planet was decades in the making… and well worth the wait! | NASA 360

Five years ago today, our New Horizons mission reached Pluto. The spacecraft revealed that what we once knew only as a tiny dot is a complex and beautiful world: solarsystem.nasa.gov/pluto | NASA Solar System Exploration

Many people still don’t understand why Pluto was reclassified as a dwarf planet in 2006, including four-year old Charlie. Here, leading astrophysicist and Academy Fellow Professor Elaine Sadler explains Pluto's planetary demotion. | Australian Academy of Science