Mercury mystery of the magnetic field: molten liquid internal memory.

World Scientific reports [tech.] News: new study found that Mercury is closest to the sun that exist within the molten liquid. .And their research methods and cooks to judge an egg is raw or cooked similar trick. .<P> Few years ago, this finding may help explain why the people found in Mercury will have a small magnetic field. .</ P> <P> so far been detected at close range, only NASA Mercury Mariner 10 spacecraft (Mariner 10), which flew over the Mercury in 1974-1975, and recorded the weak magnetic field of Mercury .But scientists believe that the small size of Mercury, so it already has been solidified within. .Usually people think, with the Earth, if you want to generate the magnetic field, it must have a melting interior. .For example, the moon and Mars, in ancient times they have there is a huge magnetic field, but later disappeared. .</ P> <P> the current NASA's Mercury probe "messenger" (Messenger) is the way to fly Mercury, is expected to arrive next year will be able to. .At the same time, from assistant professor of astronomy at Cornell University, Jean-Luc Margot leads a research team is on the inside of Mercury. .</ P> <P> chefs want to know an egg is raw or cooked method is often rotated with eggs, cooked eggs because the interior is solid, it can smooth the rotation, because the internal is the liquid raw egg ., so it will be shaking when rotating. .</ P> <P>, of course, Mercury may be small, but the researchers also impossible to rotate it. .However, they are using in California, Puerto Rico and West Virginia, the movement of Mercury Space Telescope on a careful study. .</ P> <P> send them to Mercury strong radar signal, and then place in the separate receive distant reflection, these reflections show some unique spot pattern, reflecting the uneven surface of Mercury. .By measuring how long a particular spot again at another location, they can calculate the rotation rate of Mercury, but also accurate to one hundred thousandth. .</ P> <P> this observation have been carried out 5 years, scientists have measured out of the rotation of the swing case of Mercury, also known as libration (librations), caused by the solar gravity. .They found out that they measure the libration of Mercury Mercury is the original that is entirely within the solid double libration time, and it coincided with a melt and the outer core is rotating around its shell libration objects match .. .</ P> </ p>.