Vì Sao Hệ Mặt Trời Từng Có 11 Hành Tinh? | Hành Trình 250 Năm Khám Phá Vũ Trụ

Just about 250 years ago, humans knew almost nothing about the Solar System, beyond what could be seen with the naked eye. At that time, we only knew of 6 planets. But then, the number of recognized planets gradually increased to 7, then 8, even reaching 11 planets, before returning to the current number of 8. What caused the number of planets in the Solar System to constantly "change" like this? In this video, let's join Top Interesting as we look back at humanity's 250-year journey of exploring the Solar System. From William Herschel's first telescope, to the discovery of Uranus, then the dwarf planets of the Solar System… And then to a new era, when humanity sends spacecraft to explore new lands… -------------------------------------- #250years #SolarSystem #Planet #JourneyOfDiscovery #Sun #spacescience ❤ Subscribe to the channel here:    / @topthuvi   ❤ Join the channel membership: https://www.youtube.com/@topthuvi/join -------------------------------------- Credits: We do not fully own the materials in this video; they belong to reputable scientific organizations such as: NASA / ESA / ESO / CSA / Roscosmos / SpaceX / Envato. For more information, please contact us via the channel's introduction. Thank you!