When Pluto was “demoted” from a planet to a dwarf planet back in 2006, it was a sore subject for many. Then, in 2015, a spaceship gave us our first-ever close-up of Pluto, and everything we knew changed! Read more about why Pluto is no longer a planet and how it got its nam...
数十年来，科学家普遍认为太阳系有九大行星，但随着一颗比冥王星更大、更远的天体的发现，使得冥王星大行星地位的争论愈演愈烈。一是由于其发现的过程是基于一个错误的理论；二是由于当初将其质量估算错了，误将其纳入到了大行星的行列。因此在国际天文学联合会大会上，是否要给冥王星“正名”成为了大...
Since 2006, Pluto, once the ninth planet in our Solar System is not classified as a planet. Here’s why. The reason why Pluto is not classified as a planet On August 24, 2006, an IAU resolution created an official definition for the term “planet”. According to this resolution, there...
Why is Pluto not considered a planet? That year, the IAU tasked a small committee with creating a working definition of a "planet." They landed on three criteria: It must orbit around the sun. It must have enough mass to draw itself into a round shape. It must have cleared all other...
Why is Pluto not a planet anymore? When the IAU officially defined the word “planet” for the first time, Pluto didn’t fit. To keep its planetary status along with Earth, Saturn, and the rest, it needed to pass three tests: A planet must orbit the sun. A planet must be (mostly)...
Why does it matter? With kids these days (who weren't even born when Pluto was a planet) asking why the definition even matters, astronomers have said that it is no easy answer and we may have to look beyond our solar system in considering what makes a planet and what does not. More...
This has got to be be one of the most heartbreaking questions I get asked, "Why Isn't Pluto a Planet". And I get it a lot. I was expecting that a few years after the International Astronomical Union's controversial decision, the debate would have settled down and people would finally...
I thought that Pluto is not even considered its own planet, even in the dwarf category. I am under the impression that Pluto and its counterpart, Chiron, rotate around a shared center of gravity, thus making it a binary system. Why am I thinking that Pluto-Chiron is classified by the IA...
Now, any object that does not meet this level will be thought as a dwarf planet, so Pluto is a dwarfplanet.When was Pluto discovered?A.In 1930.B.In 1969.C.In 2005.D.In 2006.What can we learn from the passage?A.Pluto is thought to be a dwarf planet now.B.Pluto is made up of...
For a long time, Pluto was considered to be the 9th and tiniest planet in our solar system. However, after scientists made some new discoveries, they decided it really wasn't a planet after all. Come learn about Pluto and why it is no longer called a planet. ...