教科書要重寫了 冥王星不再是行星
不到一小時前IAU決議不再將冥王星列為行星之一
因此以後只有八大行星
以下是網路上的國外新聞全文
Pluto not a planet, astronomers say
The Courier-Journal
PRAGUE, Czech Republic (AP) — Leading astronomers declared Thursday that
Pluto is no longer a planet under historic new guidelines that downsize the
solar system from nine planets to eight.
After a tumultuous week of clashing over the essence of the cosmos, the
International Astronomical Union stripped Pluto of the planetary status it
has held since its discovery in 1930. The new definition of what is — and isn
’t — a planet fills a centuries-old black hole for scientists who have
labored since Copernicus without one.
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