15 janv. 2005 - Demote Pluto
Description:
Neil Tyson joins with a group of scientist in leading a campaign to demote Pluto to a dwarf planet. Though it was a controversial issue, he explained how it failed to meet the qualifications of a planet. The next year in 2006, the Internation Astronomical Union reclassified Pluto as a dwarf.Ajouté au bande de temps:
Date:
15 janv. 2005
Maintenaint
~ Il y a 20 ans