Why pluto is out from the solar system?

Question

plut is a dwarf one.

Answer 1

Pluto is still a part of the solar system. (It's not like it suddenly vanished.)

But because of its size and highly erratic orbit, it is no longer considered a planet.

Answer 2

About 2,500 scientists meeting in Prague have adopted historic new guidelines that see the small, distant world demoted to a secondary category.

The researchers said Pluto failed to dominate its orbit around the Sun in the same way as the other planets.

The International Astronomical Union's (IAU) decision means textbooks will now have to describe a Solar System with just eight major planetary bodies.

HAVE YOUR SAY
I don't see the need to redefine the solar system

Siraj Ahsan, Dubai


Send us your comments
See the new Solar System
Pluto, which was discovered in 1930 by the American Clyde Tombaugh, will be referred to as a "dwarf planet".

There is a recognition that the demotion is likely to upset the public, who have become accustomed to a particular view of the Solar System.

Teary-eyed

"I have a slight tear in my eye today, yes; but at the end of the day we have to describe the Solar System as it really is, not as we would like it to be," said Professor Iwan Williams, chair of the IAU panel that has been working over recent months to define the term "planet".


The meeting had seen some fierce arguments before final voting
The need for a strict definition was deemed necessary after new telescope technologies began to reveal far-off objects that rivalled Pluto in size.

Without a new nomenclature, these discoveries raised the prospect that textbooks could soon be talking about 50 or more planets in the Solar System.

Amid dramatic scenes in the Czech capital which saw astronomers waving yellow ballot papers in the air, the IAU voted to block this possibility - and in the process took the historic decision to relegate Pluto.

The scientists agreed that for a celestial body to qualify as a planet:

it must be in orbit around the Sun
it must be large enough that it takes on a nearly round shape
it has cleared its orbit of other objects
Pluto was automatically disqualified because its highly elliptical orbit overlaps with that of Neptune. It will now join a new category of dwarf planets.

Icy reaches

Pluto's status has been contested for many years. It is further away and considerably smaller than the eight other "traditional" planets in our Solar System. At just 2,360km (1,467 miles) across, Pluto is smaller even than some moons in the Solar System.

PLUTO - A 'DEMOTED PLANET'
Named after underworld god
Average of 5.9bn km to Sun
Orbits Sun every 248 years
Diameter of 2,360km
Has at least three moons
Rotates every 6.8 days
Gravity about 6% of Earth's
Surface temperature -233C
Nasa probe visits in 2015
Its orbit around the Sun is also highly tilted compared with the plane of the big planets.

In addition, since the early 1990s, astronomers have found several objects of comparable size to Pluto in an outer region of the Solar System called the Kuiper Belt.

Some astronomers have long argued that Pluto would be better categorised alongside this population of small, icy worlds.

The critical blow for Pluto came with the discovery three years ago of an object currently designated 2003 UB313. After being measured with the Hubble Space Telescope, it was shown to be some 3,000km (1,864 miles) in diameter: it is bigger than Pluto.

2003 UB313 will now join Pluto in the dwarf category, along with the biggest asteroid in the Solar System, Ceres.

Named after the god of the underworld in Roman mythology, Pluto orbits the Sun at an average distance of 5.9 billion kilometres (3.7 billion miles) taking 247.9 Earth years to complete a single circuit of the Sun.

An unmanned US spacecraft, New Horizons, is due to fly by Pluto and the Kuiper Belt in 2015.

Answer 3

Pluto is still in the solar system.

It is no longer regarded as a planet and is now called a dwarf planet because of it's small size.

Answer 4

Because it is small compare to other planets and most remote known planet of the solar system,ninth in order from the sun, therefore. PLUTO the Greek God of the underworld has protested

Answer 5

Because it's smaller than half of the satellites in the solar system.
Xena, Ceres, Pluto and Charon have all been classified as Plutonians - a sub category of planet.

Answer 6

Pluto is now considered a "dwarf planet" because it has an oblong orbit that overlaps with Neptune's orbit.

Answer 7

I don't know what Pluto did to anger the group deciding what makes a planet.

Answer 8

Nevermind Pluto... Why the heck did scientists name a planet... Uranus??

Answer 9

Who said...

Its not.. When I read science, Pluto was a part of our solar system...

How can the university cheat meeee!!!!!!

Answer 10

pluto is still in the solar system.