What is the difference between a planet and a star?

What is the difference between a planet and a star?

  1. The star is a cosmic body emitting light, possessing a powerful source of energy. The star can have such properties if, firstly, thermonuclear reactions occur in it, and secondly, there are processes of gravitational compression, as a result of which a very large amount of energy can be released.
    Previously, a planet was considered any cosmic body rotating around a star, glowing with light reflected from a star and measuring more than asteroids.
    About the seven planets mentioned in ancient Greece as the holy bodies moving in the sky against the background of fixed stars. These space objects: the Sun, Mercury, Venus, the Moon, Mars, Jupiter and Saturn. It is noteworthy that this list includes the Sun (the star) and the Moon (the satellite of the Earth), and the Earth was not included, since the ancient Greeks believed that the Earth is the center of everything.

    Planet-in the 15 century, Nicolaus Copernicus came to the conclusion that the center of the system of planets is not Earth (as previously thought), namely the Sun. His conclusions, he reflected in the work On the conversion of heavenly spheres. Therefore, the Sun and the Moon were removed from the list, and the Earth was added to it. When telescopes appeared, they opened another 3 planet. In 1781, Uranus. In 1846, Neptune. In 1930, Pluto was discovered, which now does not count as a planet.

    Now scientists give a new definition of the planet. The planet is a heavenly body that satisfies 4 conditions:

    1. Turn around the star (planets of the solar system revolve around the Sun);

    2. The body must have a spherical or near-sphere shape, and for this to happen, it must have sufficient gravity.

    3. The body should not be considered a star.

    4. Other celestial bodies near their orbit should not have a celestial body.

    All cosmic objects are called celestial bodies and they are divided into 4 groups: stars, planets, asteroids, comets.

    So what is the difference between a planet and stars:

    Even in remote antiquity, observers observed that in the sky except for fixed stars there are special wandering luminaries, and called them planets (a planet in translation from Greek wandering). At first glance, the planet and the star are really very similar. But if you look closely, you can see that the stars are flickering, and the planets are shining with even calm light. This is because the stars, like our Sun is a hot gas ball, and the planets do not have their own light, we see them because they reflect the sunlight falling on their surface. In a binocular or a telescope, the planet is visible as a small light circle, and any star is always a glowing dot. If you observe the sky for a few nights in a row, you can see that the planets move against a background of stars that are immobile in relation to each other. The paths of the planets are mysterious loops for observers on a moving Earth. The planets move along the same path as the Sun and the Moon. They move through the zodiacal constellations, almost not deviating from the ecliptic.

    The most widely available observations are Venus, Mars, Jupiter and Saturn. Venus looks dazzling white, Jupiter yellowish-white, Mars reddish, and Saturn dull yellow. Venus can be seen in the western or eastern part of the firmament in the rays of the evening or morning dawn. The rest of the planets are visible at any hour of the night.

    The location of the planets from the Earth and the Sun is continuously changing, and therefore their apparent diameter and brilliance is changing.

    The planets, unlike the stars, show phases like the moon.

    The main difference between planets and stars is that they move around the common star of the Sun, their set: planets, satellites of planets, asteroids (small planets), and the Sun is one. The only source of light and warmth in the entire Solar system.

  2. The answer to observe the planets can be seen that they always shine with the even light of the planet appear bright wandering lights in the night sky but consist of cold sand and dust stones but why they then shine try to do an experiment bed on a table black cloth put on not stone and close the window leave only a small crook so that the sunbeam through does not fall directly on the stone and then something happens a miracle ordinary gray cobblestone is glowing in the darkness and that's the answer to the planet's question reflect the light of the sun help
  3. The sun is a star. There is oxygen on the planet, you can live there. On the star - no.
  4. The planet is a cosmic body:
    - making a motion along a near-circular orbit around the star;
    - having a shape close to the ball;
    - Luminous reflected light.
    The star is a gravitationally bound and spatially separated mass of matter in the universe in which thermonuclear reactions of the synthesis of chemical elements occur for a certain time interval. The star is a self-luminous plasma ball.
    Stars:
    - contain the bulk of the substance of the universe;
    - differ in luminosity, mass, surface temperature and chemical composition.

    Well, the Sun-star

  5. The very first and most important thing is that the star emits light. On a heavenly skyscraper this looks like flickering. And the planet light only reflects. In themselves they are dark bodies and if they do not get light on them, then it will be impossible to see them.

    What is the difference between a star and a planet? Secondly, stars have a much higher temperature than planets. On the surface of stars, the temperature ranges from 2000 to 40000 degrees, not to mention the center, where it can possibly reach millions of degrees. While this is not exactly known, since modern science does not know of any device that could withstand such temperatures.

    Thirdly, the star mass is much higher than the mass of the planets. As a rule, all stars are very massive bodies. But the planets are much smaller.

    In the fourth, the planets move relative to the star. Absolutely also like our Earth around the sun. A star remains fixed relative to the planets. In other words, planets move around their stars and necessarily along an elliptical trajectory. This is noticeable, if for a starry sky to observe for several consecutive nights. This also explains the fact that, unlike the stars, the planets "show" different phases in exactly the same way as the moon.

    What is the difference between a star and a planet? Fifth, the chemical composition of the planet contains both solid and light elements. But the star is mostly only easy.

    Sixthly, the planets often have from one to several satellites at a time, but stars do not. Although, of course, the lack of a satellite is not yet a fact that it is not a planet.

    And, in the seventh place, thermonuclear or nuclear reactions always take place at all the stars. On the planets, such reactions are not observed. In exceptional cases, only nuclear and very very weak and then, only on nuclear planets.

  6. The sun is of course a star. Stars consist of hot gas.
  7. temperature
  8. The difference between a planet and a star.
    1. The size. The star in most cases is larger in diameter than the planet.
    2. Weight. The mass of the star is much greater than the mass of the planet.
    3. Chemical composition. The star contains mostly light elements, the planet contains both light and heavy elements.
    4. Temperature. The temperature of the planet is much lower than that of the star. Therefore, the spectrum of the radiation of the planets extends to infrared radiation inclusive. Stars radiate in visible, ultraviolet, X-ray and gamma radiation.
    5. Brightness and luminosity. The stars themselves emit light, and the planets reflect the light incident on their surface (or reflect it due to the presence of a gas shell).
    6. Chemical reactions. In the stars, nuclear and thermonuclear reactions take place in the entire volume of the star; on the planets (not at all) only nuclear reactions are possible, and only within the core of the planet.
    7. Movement in space. The planets move around the stars along an elliptical trajectory. Planets can have one or more satellites.
    8. The sun is a star. Refers to the class of yellow stars. (The temperature of the Sun is not very high and not very low).
  9. The very first and most important thing is that the star emits light. On a heavenly skyscraper this looks like flickering. And the planet light only reflects. In themselves they are dark bodies and if they do not get light on them, then it will be impossible to see them.

    What is the difference between a star and a planet? Secondly, stars have a much higher temperature than planets. On the surface of stars, the temperature ranges from 2000 to 40000 degrees, not to mention the center, where it can possibly reach millions of degrees. While this is not exactly known, since modern science does not know of any device that could withstand such temperatures.

    Thirdly, the star mass is much higher than the mass of the planets. As a rule, all stars are very massive bodies. But the planets are much smaller.

    In the fourth, the planets move relative to the star. Absolutely also like our Earth around the sun. A star remains fixed relative to the planets. In other words, planets move around their stars and necessarily along an elliptical trajectory. This is noticeable, if for a starry sky to observe for several consecutive nights. This also explains the fact that, unlike the stars, the planets "show" different phases in exactly the same way as the moon.

    What is the difference between a star and a planet? Fifth, the chemical composition of the planet contains both solid and light elements. But the star is mostly only easy.

    Sixthly, the planets often have from one to several satellites at a time, but stars do not. Although, of course, the lack of a satellite is not yet a fact that it is not a planet.

    And, in the seventh place, thermonuclear or nuclear reactions always take place at all the stars. On the planets, such reactions are not observed. In exceptional cases, only nuclear and very very weak and then, only on nuclear planets.

  10. The planet can not be seen with the naked eye.
    A star is a cluster of cosmic bodies (planets), the so-called galaxies. And the glow comes from their luminary, the sun and is a star.
  11. To distinguish in the sky a planet from a star it is possible on a number of signs. First of all, the planets move between the stars, but their movement can be seen only by observing for several evenings. Such planets as Venus and Jupiter are easy to recognize, because they are much more brilliant than the brightest stars. The distinguishing feature of each planet is its color: Venus has white color, Mars has reddish color, Jupiter has yellowish white, Saturn has yellow color. To distinguish the planet from the star can still be due to the fact that all stars are flickering, and the planets usually shine with an even, almost unblinking luster. As you know, the twinkling of stars is caused by air vibrations, through which rays pass on the way to the eye of the observer. But stars even in the strongest telescopes are dotted, and planets have noticeable apparent dimensions, since they are much closer to us than stars. Each point of the planet's disk, too, seems to be flickering. changes its luster, but at the same time, the increase in brightness in one current is accompanied by its weakening in the other. As a result, these "flickering" of individual points of the planetary disk, forming, create a constant brightness of each part of the disk in time, and the light from the disk as a whole is also obtained unchanged. But in order not only to be able to distinguish planets from stars, but also to distinguish them from each other and to find them in the sky, it is necessary to know well the starry sky - the main constellations and bright stars, especially the so-called zodiacal constellations, through which the Sun, Moon and planets move. There are twelve such constellations.
  12. Even in remote antiquity, observers observed that in the sky except for fixed stars there are special wandering luminaries, and called them planets (a planet in translation from Greek wandering). At first glance, the planet and the star are really very similar. But if you look closely, you can see that the stars are flickering, and the planets are shining with even calm light. This is because the stars, like our Sun is a hot gas ball, and the planets do not have their own light, we see them because they reflect the sunlight falling on their surface. In a binocular or a telescope, the planet is visible as a small light circle, and any star is always a glowing dot. If you observe the sky for a few nights in a row, you can see that the planets move against a background of stars that are immobile in relation to each other. The paths of the planets are mysterious loops for observers on a moving Earth. The planets move along the same path as the Sun and the Moon. They move through the zodiacal constellations, almost not deviating from the ecliptic.

    The most widely available observations are Venus, Mars, Jupiter and Saturn. Venus looks dazzling white, Jupiter yellowish-white, Mars reddish, and Saturn dull yellow. Venus can be seen in the western or eastern part of the firmament in the rays of the evening or morning dawn. The rest of the planets are visible at any hour of the night.

    The location of the planets from the Earth and the Sun is continuously changing, and therefore their apparent diameter and brilliance is changing.

    The planets, unlike the stars, show phases like the moon.

    The main difference between planets and stars is that they move around the common star of the Sun, their set: planets, satellites of planets, asteroids (small planets), and the Sun is one. The only source of light and warmth in the entire Solar system.

  13. all
  14. well, the pancake on the stars tromping temperature found out that there is no air and they are from us further than the sun and the sun from the planet 3mln km and then zvzd to the nearest star except the sun is a star e called mimdums this star from the earth just what those 890mln it is finite little but the person still does not reach such kilometers can in 700 years
  15. Planet
    a natural heavenly body that:
    - has a certain density
    - rotates around its axis
    - orbit around the star
    - massive enough to become rounded under the forces of its own gravity, but not massive enough to start a thermonuclear reaction

    Star
    A natural celestial body in which, under the influence of its own gravity forces, a compression of matter occurs, sufficient to initiate a thermonuclear reaction.
    The temperature inside the stars is determined by millions of degrees, but is measured, however, not in degrees, but in a special unit of measurement - Kelvin. Kelvin is equal to a degree of Celsius + 273, that is, the count is from almost zero. The main elements of the stars are hydrogen and helium. The average density of the Sun is 1,4 g / cm. cubic.

    With a thermonuclear reaction, a huge amount of light, wave, and thermal energy is released into space. So, the temperature on the surface of the Sun is 5000-6000 Kelvin. Our battery is a typical star of the spectral class G2V a yellow dwarf.

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