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Pluto is the second most massive dwarf planet. Initially it was considered 9th planet of our solar system but a debate raged for 75 years over its legitimacy as a planet. Discovery of Eris a much bigger body urged International Astronomical Union to describe in 2006 what a planet is. According to the definition Pluto was stripped of its planetary status.
Wiki User
∙ 9y ago
Wiki User
∙ 12y agoActually it wasn't one person - although astronomer Mike Brown was important in the process. He was the one to discover Eris, a body as large as Pluto and in fact heavier than Pluto. So if Pluto was a planet, Eris surely would have to be so too.
It looked likely that many more 'planets' were waiting or discovery in our solar system. So it was generally felt that 'planet' needed a real definition. After many discussions it was decided that a planet was mostly round, and dominant in its orbit. Pluto is round - but certainly not dominant. Therefore no longer seen as a planet.
But in fact Pluto was for many years by a long way the odd one out among the (then still) nine planets. Very small, crossing Neptune's orbit, it 'had it coming' as the subtitle of Mike Brown's excellent book suggests...
Wiki User
∙ 11y agoThe International Astronomical Union, or IAU. This announcement was made after long deliberation, August 24, 2006.
Wiki User
∙ 13y agoThe international Union astronoms (IUA) reclassified Pluto as a dwarf planet.
Wiki User
∙ 7y agoBecause Pluto is too small
Anonymous
because it was considered a mucrisited planet. that means it was way to kerting to be a regular planet
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Do all astronomers think that Pluto is a planet?
No. It was categorised as a dwarf planet in 2006, but not all astronomers agree with that decision.
What Pluto observations did not help convince scientists to change Pluto's status from that of a planet?
The discovery of Pluto's 3 moons.
Do all astronomers think Pluto planet?
No. Most follow the new IAU definition of a planet which excludes Pluto.
How do astronomers account for the origin of Pluto?
Astronomers used to consider that Pluto was a planet and have now stated it is just one of many objects in the Kuiper Belt. The Kuiper Belt is made of the leftovers in the creation of the Solar System.
How were the astronomers able to study planet Pluto?
because of the Hubble telescope pictures.
Do all astronomers think that Pluto is a planet?
No. It was categorised as a dwarf planet in 2006, but not all astronomers agree with that decision.
Who made the decision about the status of Pluto?
Bob Saget
Is Pluto a planet in 2015?
The International Astronomical Union "demoted" Pluto from true planet to dwarf or minor planet status in 2006; it is highly unlikely to reverse that decision and change the definition back to include Pluto as a planet in 2015.
Do astronomers think Pluto is a planet?
Astronomers think Pluto is a dwarf planet. And they're right.
What Pluto observations did not help convince scientists to change Pluto's status from that of a planet?
The discovery of Pluto's 3 moons.
Who changed Pluto to a dwarf planet?
The International Astronomical Union, the world-wide association of astronomers. The decision remains controversial, even among astronomers, and it is possible (although perhaps unlikely) that it will be reconsidered.
Do all astronomers think Pluto is a panet?
No. There are almost no astronomers that think Pluto is a planet. They know it's officially a dwarf planet.
Why don't astronomers think Pluto should not be called a planet?
Pluto has been the ninth planet in our solar system ever since it was discovered. However, as a small rocky planet with a very strange orbit, it doesn't really fit in with the rest of the gaseous outer planets. Pluto is much more similar to a group of objects called Trans-Neptunian Objects (TNOs), or asteroids. So, some astronomers don't think Pluto should be called a planet.The International Astronomical Union (IAU) gets to decide questions for astronomers around the world. They have been talking about Pluto's status, and what it should be called. Since Pluto is very important to a lot of people, the IAU isn't going to take away Pluto's status as a planet. They are talking about calling Pluto both a planet and a TNO, but Pluto still is and will be a planet!
Where is the astronomers that discovered Pluto?
las cruses
Is Pluto still ninth planet of your solar system?
There are now only eight planets in the solar system. In 2006, in a controversial decision, Pluto was demoted to the status of a "dwarf planet."
What is the planet that astronomers don't think is a planet?
pluto
What planet some astronomers don't think is a planet?
Astronomers have decided that Pluto does not meet the definition of a planet.
