3 main differences between star and planet?

star

  • it has its own light
  • it is made up of gases
  • it has a lrge tempreture

planet

  • not has own light
  • made up of rocks and minerals
  • not so high tempreture

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                                                  star

A star is a mass of gas held together and given its shape by its own gravity. Gravity is constantly squeezing the star, trying to make it collapse. This collapse is prevented by the radiant pressure from the hot gas in the star's interior. This is called hydrostatic support, or equilibrium.

During most of the star's lifetime, the interior heat and radiation is provided by nuclear reactions at the center; this phase of the star's life is called the main sequence.

In a main sequence star, the nuclear reaction in its core is created by the fusion of hydrogen nuclei into helium nuclei.

The main sequence phase of a star is analogous to the adult life of a human through middle age. What happens after all the hydrogen has been fused into helium and the main sequence phase ends is determined primarily by the mass of the star.

Once all the hydrogen has been converted into helium at the core, stars begin to collapse in on themselves. The star will contract until there is enough pressure to ignite the hydrogen core. This triggers the next phase of a star's life: the hydrogen conversion into carbon phase.

During this phase, the outer layers of the star expand outward and the star swells to a much larger size. Sometimes the collapse and expansion occur very quickly and this process is accompanied by a very large explosion, called a supernova. This expansion makes the star appear brighter but cooler, and it becomes a red giant.

Stars more massive than our sun will eventually collapse into a white dwarf. The leading theory of stellar evolution is that white dwarf stars eventually cool and become black dwarfs.

Stars with an exceptionally high mass will collapse into neutron stars or even black holes. Some neutron stars acquire a spin and become known as "pulsars." While these dead stars do not emit visible light, they often emit other radiation, such as gamma and x-rays that planets lack.

Stars are classified by astronomers based on their surface temperatures. Stellar classifications are: O, B, A, F, G, K, and M. While this may seem complicated, astronomers have a fanciful mnemonic: Temperatures range from less than 3,500 degrees Kelvin (Class M, Red stars) up to 60,000 degrees Kelvin (Class O, Blue stars).

                                                       planets

PLANETS:

As mentioned above, the definition of a planet is not so clear cut. There has been much debate recently over what the word "planet" really means.

The origin of the word "planet" is rooted in Greek and means literally "wanderer." This is no doubt a reference to the apparent motion of planets in the sky. While this is interesting, it is not very helpful as an astronomical definition.

In fact, it was the informal definition for many years. Planets appear to change location in the sky night from night, whereas stars seem not to move appreciably from one night to the next. So it was assumed that noticeable change in location from one night to the next meant the object was a planet.

At the end of the 20th century and into the beginning of this century, there started to be more debate on just what classified an object as a planet. This is mainly due to a large number of planets discovered outside the solar system and, of course, the recent Pluto controversy.

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A star is a huge ball of hot glowing gases whirling in space. Our sun is a star and the only one close enough to earth for us to see its ball shape. Many other stars in the universe are much larger than the sun, some even 1,000 times larger.

But all are made up of the same two gases, hydrogen and helium. The stars shine because atomic energy at their center makes them very hot. They shine night and day, but we see them only at night when the sky is dark.

A planet, on the other hand, is a smaller, solid body which does not shine by its own light, but rather by the light reflected from the sun. While planets shine steadily, stars seem to twinkle. This is because of the movement of layers of air between the stars and the earth.

Scientists believe that the sun and all the planets were originally formed from clouds of gas and dust left over from old stars when they exploded!

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Stars are a collection of burning gases that give off light, some with planets orbiting and some without. A planet is a body that orbits a star. They generally have atmosphere and they only reflect light. In the night sky, if you look up you can see the difference. The light from a star "twinkles" while the light from a planet is steady.

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star  emits its own light  but planets dont .

stars are fixed at one posituion . planets move around the sun 

stars can be seen in the night. not all the planets can be seen in the night sky

ex-sirius      ;  ex - jupiter 

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Star

  • A star has its own light.
  • Stars twinkle at night.
  • The relative positions of the stars do not undergo any noticeable change.
  • Since the stars are very far away, the telescope can only make them look brighter but not larger.
  • A star has very high temperature.
  • There are billions of stars in the celestial sphere.

Planet

  • A planet has no light of its own. It shines by reflecting the light of the sun.
  • Planets do not twinkle.
  • Since planets are very mush closer to the earth than the stars are, their motion around the sun is noticeable as a daily shifting of their relative positions in the sky.
  • Most planets on the other hand are near enough to the earth to be magnified by the telescope.
  • Planets have low temperatures.
  • There are only nine planets in the solar system.
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Star has its own light. It appears to rise in east and set in west. Stars seem to twinkle.

Planets do not have their own light, rotate from west to east(exept Venus n Uranus), they do not twinkle.

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A star has its own light but a planet doesn't .

a planet is far more smaller and less dense than a star.

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1.star own light and planet does not.

2.star twinkle and planet do not.

3.planet change the positions whereas stars do not.

4.planet are small and stars are big.

5.stars are made up of gases whereas planets are made up of rocks and minerals.

6.stars have very high temprature whereas planets do not have so high temprature.

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stars have light planets dont

stars twinkle planets dont

stars r relatively big compared to planets

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When you look up into the clear night sky, you will see a vast array of twinkling lights sprinkled across the heavens. It is an awe inspiring site today, just as it was the ancients that first began observing celestial movements thousands of years ago. Even though it is difficult to tell the difference between stars and planets with your naked eye, they are vastly different celestial bodies with different origins and functions.

Definition
Star ‘“ is huge collection of plasma and gases that are held together by gravity. A star gives off an enormous quantity of energy as light and heat because of the thermonuclear fusion that is taking place in its core.
Planet ‘“ is a celestial body that orbits around a star. It can be rocky, gaseous, or a combination of the two. It has its own field of gravity holding it together but that gravity is not strong enough to produce a thermonuclear reaction.

Formation
Star ‘“ most stars that we see are millions of light years away, and therefore we are seeing the stars as they looked millions of years ago. Since many of these observable stars are mature, we can assume that most stars are billions of years old. Stars begin with a cloud of atoms, such as hydrogen. This cloud gets denser and denser until there is enough pressure on the core to cause the nuclear reaction that creates helium from hydrogen. The star starts giving off light and heat and is technically ‘born.’
Planet ‘“ are thought to be formed at the same time as its parent star. As matter begins to collect in the dense core of the soon to be star, other smaller centers of gravity may begin to form within the stars orbit. These proto-planets will continue to grow and collide with each other until the star becomes mature. Eventually the planets as we know them form.

 

History of Human Discovery
Star ‘“ Man first began to make star charts in ancient Egypt, over three thousand years ago. As telescopic technology has advanced, mankind has begun to study the composition, age, distance, and characteristics of stars.
Planet ‘“ were first thought to be wandering stars because visible planets like Mars and Venus don’t hold a fixed course like the rest of the stars in the sky. During the Renaissance, Galileo and Kepler proved that the planets rotated around the sun. As the Space Age dawned, man has sent probes and robots to all the planets in our solar system.

Summary:
1.Planets are stars are both heavenly bodies mostly observable to the naked eye.
2.Stars are large collections of gas that have a nuclear reactor at their core, whereas planets can be almost as large but lack the nuclear reactor.
3.Stars are the first to form when a new solar system is being created and planets are created later within the orbit of the star.
4.Throughout history mankind has been observing both stars and planets.

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The common difference between a planet and a star is that a planet is a smaller solid body that does not shine by its own light but by the light which is reflected from the sun. A star on the other hand is a huge ball of hot glowing gases that whirls in space.

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Stars create their own light whereas planets reflect by the light ommitted by the stars. Stars are much massive than planets if any planet is 75 times more than jupiter it becomes a star!. A star releases energy by having thermonuclear fusion happening in its core whereas a planet doesnot.

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