The super planet is the planet in the solar system that orbits outside the earth.Terrestrial planetThere are Mercury, Venus and exoplanets including Mars, Jupiter, Saturn, Uranus and Neptune.The dynamic position change of the exoplanet relative to the sun is between close, western light, blunt, eastern light and close.It can be seen in other positions except that it is invisible near the door.
Chinese name
Exoplanet
Foreign name
superior planet
Definition
Planets in the solar system orbiting outside the earth
Harvard Smith AstronomyPhysicsRobert Noyes, an astronomer at the center, is a member of the Gaspar research group. He said that theorists' models of planetary structure and development cannot explain why there is such a small density and hugeplanet。Nasa planetary expert Jack Risol said that the problem is not what kind of material such planets are made of, but how they can keep their temperature and not shrink.Planets are warm and large when they are born, but it takes energy to maintain this state.No one knows where these energies come from.
After a year of tracking and observation, astronomers found aExtrasolar planets。The diameter of the planet isJupiter3/4, its core is 70 times that of the earth, and 1/2 to 2/3 of its mass comes from the coreHeavy element。Relevant papers will be published in《Astrophysics》Magazine.
Using a smaller telescope in Arizona, the scientists found thatRevolution periodThe brightness of the mid star has a 0.3% decline, which indicates that the planet's orbit has directly passed the line between the star it orbits and the Earth.Scientists take this opportunity to“Occultation method”The size and mass of the planet were measured, and its density was calculated.After calculation, to reach this density, the planet cannot be composed of only gas, and its interior is more than 70 timesEarth massA huge solid core can be formed.
The temperature of the planet is as high as 1200 ℃.It is only one quarter of the distance from the earth to the sun from the star.It may be that the friction makes its speed drop, and the gravity of the star drags it to the current orbit that is closer.
University of CaliforniaSanta Cruz"This is a very strange celestial body," said Greg Laughlin ofTokyo University of TechnologyDr. Shigeru Inoda believes that this is self discovery51 Pegasi The most important discovery since Planet X has broken through the theory that the mass of the star core is 30 times the mass of the Earth.
Challenges
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In fact, this discovery challenges two major theories of planetary formation.According to the "core growth model", the formation of planets is like a snowball. Continuous random collisions gradually aggregate into a solid core. The gravity of the growing core is increasing, and it begins to attract more materials and gases.In the "gravity instability model",gas giant The dust and gas cloud surrounding a young star condenses directly and forms rapidly.
Lavlin believes that gas giants in the "gravity instability model" can be obtained by collision with comets or asteroidsHeavy elementHowever, it is impossible to obtain as much material as is currently observed.He believes that this planet is an exception. One explanation for this high-density core is that it may have collided with one or more planets.If so, this collision may cause the planet to break away from its surrounding starEquatorial plane。Scientists are currently studying itsAutorotation shaftTo find out the truth.
Extraterrestrial planet discovery
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Scientists have found more than 20 planets outside the solar system, including some of the most bizarre so far.Astronomers introduced to the world the most massiveExtrasolar planets――OGLE-2005-BLG-390Lb。Its mass is about 5.5 times that of the earth, and it is most likely a rock sphere covered with ice, surrounding a rock sphere about 21000 away from the earthLight yearFar away coldRed dwarfRotate.In September, another newly discovered extrasolar planetHAT-P-1Rewrote the historical record again.It is the largest and smallest planet ever discovered, with a diameter of aboutJupiterAbout 1.5 times the diameter.
What's more surprising is that HAT-P-1 has only half the mass of Jupiter.Because its density is smaller than cork, it can float in water.Then, astronomers found the fastest known planet SWEEPS-10 in October. It only lasts ten hours a year and its surface temperature may be 3000 degrees Fahrenheit.If the temperature of its home star is higher than it, SWEEPS-10 may bevaporization。
forecast
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An American astronomical team is 15 meters away from the earthLight yearA planet discovered in AquariusExtrasolar planetsIt is the most similar to Earth, but the temperature of this planet is not suitable for known life forms.
This planet is aroundAquariusStars“Gris 876”The third planet of."Gris 876" belongs toGalaxyThe most common type of star inRed dwarfAnd its mass is aboutsunlightOne third of.In addition to the newly discovered planet, there are two giant gas planets orbiting it.This planet has a radius twice that of the Earth and a mass 7.5 times that of the EarthExtrasolar planetsIts mass is at least 15 times that of the earth.Since it is only 1.2 million kilometers away from the star "Gris 876", which is only 10 times the radius of the star itselfRevolution periodOnly about 2 Earth days.
Astronomers believe that the core of this planet may be made of iron or nickel, the surface is covered with silicon, and there may even be water vapor in the atmosphere.However, scientists estimate that the surface temperature of this planet is as high as 200 to 400centigrade, life on earth cannot survive.
Over the past 10 years, astronomers have found more than 170 planets outside the solar system, but most of them belong toJupiterSuch a giantGaseous planetIt does not have the conditions for life.Six of them are similar in structure to our Earth.Here are sixterrestrial planetTwo of them are very cold, and the other four are almost impossible to live because they are too close to their stars.
