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The diagram shows the internal structure of Mercury. The metallic core from the center attracted much of the radius of the planet. what is saturated steam Radar observations showed that the core, or at least the outside - you die. Photo Nicole Ragr Fuller, National Science Foundation.
Researchers used precision planetary radar instruments specifically, including NASA's Goldstone Solar System Radar California, found strong evidence that the parent star has hot molten core. The finding explains the mystery over thirty years old began to Earth JPL spacecraft Mariner 10. It was published in the journal Science this week.
"Scientists did not expect to find a magnetic field at Mercury," said Professor Jean-Luc Margot of Cornell University in Ithaca, New York, the lead author. "Magnetic fields of the planets associated with molten what is saturated steam cores, and showed early theories Mercury too small to have a molten core.
Scientists theorized that Mercury consisted of a silicate mantle surrounding a solid iron core. Iron was considered solid theory, because small planets like Mercury cool off rapidly after their formation. If Mercury followed this pattern, then its core should have frozen long ago. Many believed that it will be possible to solve the problem only when the spacecraft will land on the surface of his warm, but in 2002, scientists began pointing some of the most powerful antennas on our planet at Mercury in an attempt to find the answer. On 18 occasions the last five years, JPL used the antenna 70 meters in diameter Goldstone Observatory and broadcast radio signals from radar at Mercury, says Martin Slade, co-author of the article. According to him, each time received from the planet after ten minutes Goldstone and another antenna in West Virginia.
Echo measurements specific what is saturated steam landforms Mercury what is saturated steam and measuring what is saturated steam the amount of time it takes to produce the simulation at both sites - Goldstone and the Green Bank in West Virginia, allowed scientists to calculate the rate of Mercury's spin to within a thousandth of a percent. The effect was also verified with three more independent what is saturated steam radar observations of Mercury through a telescope made the National Science Foundation's Arecibo, Puerto Rico.
Using data science team was able to discover tiny twists in Mercury's spin as it orbited the sun. These small variations were double what would be expected to completely solid body. The findings ruled out is solid, so the only remaining explanation was that the core, or at least the outside - molten and not forced to rotate along with its shell.
Maintaining what is saturated steam a molten core over billions of years requires that it also contain light elements such as sulfur, to lower the melting temperature of the core. The presence of sulfur supports the idea that combining fundamentals, as well as distance and closer to involved in the creation process. The chemical composition of Mercury's core can provide important clues about the planet formation process, says Margo. "It is fundamental to our understanding of how form and evolve planets like Earth."
Mercury still in its share of mysteries. Some may be NASA spacecraft Messenger, launched in 2004 and which is expected to pass the first time at the planet in 2008 maneuvers spacecraft will then begin orbiting Mercury in 2011. "We hope that Messenger will address the remaining questions that we can answer them from the ground." Margo said.
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