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

Pluto's moment to shine! 10 years ago today, after travelling more than 3 billion miles, NASA's New Horizons spacecraft made its closest approach to Pluto, passing within 7,800 miles of its surface, and providing humanity with the first close-up images of this distant world. The mission revealed Pluto's stunningly diverse landscapes including vast plains, towering mountains, and mysterious ice volcanoes, reshaping our view of the Pluto system! https://go.nasa.gov/3TtCNYk | NASA History