再見「九大行星」 Goodbye "Nine Planets"
The first time I present this lecture is July, now it's October. The talk changed from a preview to a report, now we really said goodbye to "Nine Planets". However, the story is not end yet, and its dramatic story is revealed in the lecture.
Since Pluto discovered in 1930, the term "Nine Planets" have been used for many years, but soon, the term "Nine Planets" will become history, as the International Astronomical Union will formally define what is "planet".
In 2005, an object 2003 UB313 was discovered and found to be larger than Pluto, many reports are claiming the discovery of the "10th Planet". However, the story is not that straight foward, just as same as Pluto, this object are quite different with the other major eight planets in the solar system, therefore some astronomers disagree that it is classified as a planet. Thus a hot debate about what is defined as planet is keep on, as well as the planetary status of Pluto.
The International Astronomical Union will discuss the problem in the coming General Assembly in August. No matter what is their conclusion, 8 or 10 planets, our Solar System would no longer have 9 planets.
Powerpoint snapshot of v2.0::
Recording Playback of 2006-07-21::
Further Readings ::
PAGE :: 1 SITE :: 1 stardust.net :: 1
email@example.com LAST UPDATE: 13/3/2015