1.Why the pluto is not considered as a planet?2.why our planet is revolving in its own axis?

Question

I thing earth is revolving in its oon axis only because of "BIG BANG THEORY" IS IT TRUE?

Answer 1

Rotation of the Earth:

Any rotating object rotates on its center of mass unless perturbed by an outside force. That center of rotation is referred to as the axis of rotation. Therefore, our planet Earth rotates on its axis by definition.


Pluto:

The International Astronomical Union decided that Pluto was no longer a planet. Instead, they decided to classify it as a "dwarf planet".

See the details below.

RESOLUTION 5A
The IAU therefore resolves that "planets" and other bodies in our Solar System, except satellites, be defined into three distinct categories in the following way:

(1) A "planet" [footnote 1] is a celestial body that (a) is in orbit around the Sun, (b) has sufficient mass for its self-gravity to overcome rigid body forces so that it assumes a hydrostatic equilibrium (nearly round) shape, and (c) has cleared the neighbourhood around its orbit.

(2) A "dwarf planet" is a celestial body that (a) is in orbit around the Sun, (b) has sufficient mass for its self-gravity to overcome rigid body forces so that it assumes a hydrostatic equilibrium (nearly round) shape [footnote 2] , (c) has not cleared the neighbourhood around its orbit, and (d) is not a satellite.

(3) All other objects [footnote 3] except satellites orbiting the Sun shall be referred to collectively as "Small Solar-System Bodies".


Footnote 1: The eight "planets" are: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune.

Footnote 2: An IAU process will be established to assign borderline objects into either dwarf planet and other categories.

Footnote 3: These currently include most of the Solar System asteroids, most Trans-Neptunian Objects (TNOs), comets, and other small bodies.

RESOLUTION 6A
The IAU further resolves:

Pluto is a "dwarf planet" by the above definition and is recognized as the prototype of a new category of trans-Neptunian objects.

Answer 2

Pluto's recent demotion from planet was due to the fact that it failed to meet all the criteria specified to be classified as a planet. The primary criteria that is failed on is the fact that it lacks suffient gravity to 'clear a path' in it's orbit. In other words, plutos orbit around the sun contains lots of other rocks, asteroids, etc. that would be 'sucked into' the planet should it be large enough and have enough pass to be a planet.

Our planet revolving is the norm not the exception. Almost every planet of any size will rotate to some degree. Earths rotation was caused by the effects of gravity on the space-time. I'm sure you've noticed the spin of water as it drains from your tub. While some of this is due to the spin of the earth (thus the reason that the spin is in the oposite direction below the equator as above) this is not the main reason. As things are pulled into a smaller area due to gravity, (water down the drain) the molicules tend to 'line up' in some fashion that makes the flow easier. When a planet is forming, it has a massive weight which is so massive it will 'warp' space and time into something that looks like a big drain. As more mass is added (remember pluto's non-planet argument?) it increases the spin and deepends the warp in space-time. The fact that we are pretty constant in the speed of the spin (although it does vary and is slowing slightly) is the fact that there is nothing to change the speed. No mass of any size has been added or removed in the last million or so years. Think of a top that is spinning on the desk. It wants to keep spinning but the friction between the point and the desk and sides of the top and the air slow it down. The earth doesn't have these friction points to make a noticible difference in speed.

Hope this answers the question!

Answer 3

Pluto is not considered to be a planet because it is too small and its weight is almost negligible compared to other planets, so it is not seen as a planet.

Due to the Big bang theory, earth is revolving on its own axis, you are right!!!

Answer 4

1) The astronomers that make the rules that define what is and isn't a planet said so.

2) Because of conservation of angular momentum, which is a fancy way of saying that things kept moving.

Think of it this way - the big bang spread a lot of matter throughout the universe. It wasn't evenly spread, though - some areas had more than others. This meant that gravity was stronger in some spots, and so it pulled some of the gas together here and there. The more that accumulated in one spot, the stronger that gravity was in that area, so it tended to keep growing even more.

All this matter was still moving, and it kept moving as it came together. Some moved left, some moved right, and so forth, but the net result was that the growing lump of matter had a spin to it. Since there's not a whole lot of anything out there to slow it down, momentum kept the lump spinning. The axis is the line that the lump turns around.

Answer 5

The Internation Astronomical Union (IAU) demoted the planet Pluto on August 14, 2006. The problem began with the discovery of another celestial body named Xena. Xena which is not spherical in shape but bigger that Pluto was rejected as a planet under the previous nomenclature. This presented a dilemma for the scientists as Xena was larger than Pluto. Hence the IAU unanimously voted Pluto out. Ironically the IAU was the body that deemed Pluto as a planet in 1930!

The issue of Pluto is really one of nomenclature. Nothing new has been discovered about this planet that has led to this decision.

The definition of a "planet" vaguely describes the celestial body is one with a remotely spherical body, that which revolves the sun & which possesses a certain volume. Under this new nomenclature Pluto is not a planet.

Thank you.

Answer 6

1. Many astronomers consider Pluto NOT a planet for the following reasons.
1. It is too small
2. It doesn't have an elliptical orbit
3. It's too far away

We are revolving around on our axis
The axis is just an imaginary line that gravity uses to balance the earth

Big Bang

No one knows if there was a "Big Bang" or not, we have "educated guesses" but since there was obviously no recoreded history dating back that far we will maybe never know

Answer 7

You really need to do some studying. Pluto is not a planet because it has been declassified by astronomers. Our planet's axis is DEFINED by its rotation. If there was no rotation, that would be something to wonder about. All planets spin on an axis. The "Big Bang" seems to be the origin of all astronomical motion so it's obvious that our planet's rotation is a result of that.

Answer 8

pluto not considered as planet so it mass is bellow to considered as a planet. earth revolving its on axis is an imagin

Answer 9

Pluto is too small to be thought a planet anymore.
Planets rotate on their axis thanks to the laws of conservation of momentum

Answer 10

Becose it even smaller than our Moon.
Secondly, its a dwarf planet.