Many of us remember from school that Pluto was once considered the ninth planet in the solar system. After 1992, its status was questioned following the discovery of several similarly sized objects in the outermost region of the system called the Kuiper Belt.
A fierce debate arose among astronomers, and after the discovery of Eris, which is more massive than Pluto, the International Astronomical Union was forced to formally define the term "planet" in 2006, effectively excluding Pluto from the list of planets.
Alpha Centauri, let's recap the situation a bit...
Alpha Centauri is a system made up of three stars: Alpha Centauri A (officially Rigil Kentaurus), Alpha Centauri B (officially Toliman), and Alpha Centauri C (officially Proxima Centauri). Alpha Centauri A and B form a binary pair of Sun-like stars orbiting their common center of gravity, while Proxima Centauri is a red dwarf orbiting the main pair at a distance of about 0.2 light-years. Then there's Proxima b, a planet orbiting Proxima at about 0.049 Astronomical Units—over 20 times closer than Earth is to the Sun, but still within the star's habitable zone.
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Credits: Ron Miller, Mark A. Garlick / MarkGarlick.com ,Elon Musk/SpaceX/ Flickr
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00:00 Intro
00:02 Why is Pluto Difficult to reach? How Long Would It Take Us?
14:10 Why is Alpha Centauri Difficult to reach? How Long Would It Take Us?
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