Radio 4 in Four - How Pluto was stripped of its status as a planet - 蜜芽传媒 Sounds
Radio 4 in Four - How Pluto was stripped of its status as a planet - 蜜芽传媒 Sounds
How Pluto was stripped of its status as a planet
Neil deGrasse Tyson explains how Pluto was downgraded to the status of dwarf planet.
