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jupiter was like a wrecking ball in its youth, and we now know how long a saturn day is

Once-
Wild planets may explain the unusual rarity of our solar system.
Our neighbors inside our solar system are not always so lonely.
Blame a wild and unruly young Jupiter, who once appeared like a giant billiard ball, crushing the early planets and clearing the old ones --
University of California, Santa Cruz, a crowded community of astronomers around the Sun, revealed in a report last week.
\"There is a collision-high --speed smash-
Ups-created a lot of debris in the chain reaction and hit other debris, \"said Gregory Laughlin, professor and chair of astronomy and astrophysics at the University.
Their death has brought a great deal of dust and rock debris, the ancestral components of Earth, Mercury, Mars and Venus.
Astronomers have been confused about why there are no planets in Mercury orbit.
\"This is a completely empty field. A void.
Only solar wind, \"said Laughlin, whose proposal was reported in the National Academy of Sciences journal on Monday.
Thanks to Nasa\'s Kepler satellite, the mystery deepens as we learn more about other solar systems.
We learned that this property is valuable elsewhere.
Other systems-almost 500, according to final statistics-often have many planets orbiting closer to our stars than Mercury.
These solar systems also have huge planets, such as Jupiter, known as the King of planets, closer to the sun.
\"It shows that we are special.
This is an anomaly . \" Said Laughlin. Laughlin and his colleagues
Konstantin Batygin, author of the California Institute of Technology, began to understand the reasons and asked what happened during the early evolution of the solar system, which produced this abnormal building.
Of course, there is no way to witness the actual event-it happened in the first 1 million to 3 million years after the formation of the Sun, nearly four years.
5 billion years ago. (
As far as humans are concerned, this will be the first week of the life of centenarians. )
They used pencils, paper and computers to recreate what would happen if we started with a group of rocky planets like other solar systemsin orbits.
They added to the analysis a new theory called \"Big head nail.
In 2011, another team of astronomers proposed the idea, which was simulated after a yacht blew from one side to the other.
However, Jupiter is not an elegant spacecraft, but swept through the early systems like a broken ball, crushing the new planets into pieces.
Then Saturn sucked it back, and now it retreated again. mannerly orbit.
The researchers believe that the first generation of planets, including the newly formed superearth, was destroyed and spiraled into the sun.
Then, the second generation of inner planets-Mercury, Venus, Earth and Mars-are formed from the debris left behind.
This may explain why the mass of these planets is smaller than expected and the atmosphere is much thinner, Laughlin said.
This can also explain why there is a gap inside the Mercury orbit.
The simulation at the University of California, Santa Cruz, \"may not be the only explanation,\" Laughlin said \".
\"But we are happy with the way it is combined.
\"There are all kinds of clues to this big puzzle,\" he said . \".
\"The work of astronomers is to put these pieces together and test them.
\"Jupiter\'s \'big tack\' is likely to be a \'big attack\' against the original solar system \'.
-San Jose Mercury News/Tribune News Service: How long did Saturn last day? --
Scientists use the gravitational field of the planet to \"determine\" its daily cycle.
How long is the day on Saturn?
This seemingly simple problem has plagued scientists for years, but a new study shows that the life of the ring gas giant is shorter than we thought.
Findings published in the journal Nature help solve the long term
It can help researchers better understand the complex dynamics of giant gas planets.
Measuring a day on a rocky planet like Earth or Mars is a very simple exercise-when a planet rotates, track a feature on its surface to see how long it takes to complete a full rotation.
For gas giants that do not have a solid surface and the mass is blocked by a thick layer of atmosphere, this is not simple.
Other tricks have to be used for these planets, and they don\'t always work.
35 years ago, when Nasa\'s Voyager spacecraft flew over Saturn, radio measurements of its magnetic field showed that Saturn\'s rotation time was 10 hours, 39 minutes and 22 minutes. 4 seconds.
But when NASA\'s Cassini spacecraft, which arrived at Saturn on 2004, used the same method, it reached the length of 10 hours a day, 47 minutes and 6 seconds-over time, the measurement has changed.
Saturn\'s magnetic field is aligned with its spin axis, so radio-
Frequency measurement is not a reliable way to measure its rotation cycle. (
This method works for Jupiter because it is easier to track the magnetic field of Jupiter. )
A team led by Ravit Helled at Tel Aviv University used another method of measurement: the gravitational field of the planet, and Cassini can be measured by the amount of the planet pulling in the orbit of the spacecraft.
The flat rate of the Earth-which becomes flat and begins to swell as it rotates at the equator-also helps to determine the speed of rotation.
Scientists found that Saturn completed a complete rotation in 10 hours, 32 minutes and 45 seconds (
Give or take 46 seconds)
-This means that Saturn\'s day is more than six minutes shorter than the measurement time of the Voyager mission.
To ensure that the results of Saturn are accurate, they have also succeeded in
By measuring Jupiter to check their method, Jupiter\'s daytime length is well known.
This new approach can help scientists better understand a range of different processes on Saturn, including the pattern of wind.
In the future, it can also help scientists better understand the dynamics of the gas giants that are more distant.

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