Why was Pluto downgraded to a dwarf planet?

Matt Francis

Many people will remember the controversy generated back in 2006 when the reclassification of Pluto took place. Pluto’s place as a planet at this point had been questioned since the Seventies. Other objects had been found in the Solar System of a comparable size and these objects weren’t classified as planets.

In August 2006, the International Astronomical Union (IAU) met and redefined exactly what ‘planet’ meant. It was decided that Pluto did not fit within that definition and so it was added to the new classification of dwarf planet. To qualify as a planet an object must orbit

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All About…DWARF PLANETS.

Some people are still unhappy about Pluto’s demotion to a dwarf planet, but it’s in good company — there are some fascinating celestial bodies in this category.

What makes a planet a planet? We’ve been debating this almost since planets were discovered. In 2006, the International Astronomical Union came up with the first-ever scientific definition of a planet. With that came a new classification for these heavenly bodies that weren’t quite planets, but were more than just asteroids. While this resulted in the demotion of Pluto — previously our ninth planet — it also meant that there was a whole

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In the Kuiper belt found another Pluto

Astronomers have discovered a relatively large space object orbiting the Sun in an orbit close to the orbit of Neptune, reports BBC News. He was found in the space surveillance, which is carried out in order to detect asteroids that pose a threat to Earth. This project is called Neat (Near Earth Asteroid Tracking) is carried out using a telescope at Mount Palomar in California.

Scientists have observed this object with a diameter of 570 km in diameter in the photos of the sky taken in 1998. It is located in the so-called Kuiper belt

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Opened tenth planet in the solar system

15.03.2004

15.03.2004

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Sergei Belukhin, March 15, 10:00

NASA astronomers have discovered the largest object orbiting the Sun. It is comparable in size to Pluto, although it is much more.

Opened tenth planet in the solar system

Flying Saucers: outside and inside

16.03.2004

16.03.2004

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In the late 50-ies of XX century in the Soviet press flashed unheard message: three days — 14, 15 and 16 August 1957 — around Stalinabad (now Dushanbe) were observed Aliens. Members of the archaeological team, "PIFA" were witnesses and participants of this mysterious event, details of

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The latter finding may deprive Pluto title planet

17.03.2004

17.03.2004

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Astronomers re-thinking on the classification of the planets. The impetus for this process has given the recent discovery of a celestial object, which many consider the tenth planet of the Solar System. The Working Group of the International Astronomical Union (IAU) is going to make their own

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The new planet has provoked revision astronomical terms

18.03.2004

18.03.2004

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Recently discovered tenth planet Sedna has provoked heated debate among astronomers — that it was considered a planet.

We have already mentioned that a clear boundary between planets and asteroids is not very big, and now in the solar system known to a few objects with

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Space Archaeology. Recent discoveries in the solar system

22.03.2004

22.03.2004

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Sergei LESKOV

The U.S. space telescope Spitzer on the outskirts of the solar system discovered a new planet, which is called by the name of Sedna Inuit goddess of the ocean. Astronomers estimate that the celestial Sedna is more than an asteroid, but less than all of

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Choose a name for the satellites of Pluto

On the Internet, choose a name for the satellites of Pluto

Astronomers who noticed the sky new satellites of Pluto, which are still succinctly called «P4» and «P5», offered Internet users to identify the names of the objects that would later be put for approval by the International Astronomical Union.

According to the rules of the names of celestial bodies, the satellites of Pluto should be named after characters from Greek and Roman mythology, the inhabitants of the underworld Hades.

In order to determine the rest of the world, what are the names of the suit more than others,

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Dwarf planet Eris was the size of Pluto

October 27, 2011 23:38

Eris in the representation of the artist (here and below the image ESO).

Astronomers have for the first time were able to accurately measure the diameter of Eris because the dwarf planet eclipsed star.

Such cases are very rare cover and watch their hard as dwarf planets are far away and have a small size. The next such event involving Eris is not expected before 2013. But the cover — it is the most accurate and often the only way to measure the shape and size of distant solar system bodies. Star candidate

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