Keyword: "Moon Sparkle" meteoroids caused explosion
NASA scientists record 100 monthly surface Flash location map
According to the NASA website reported that it wasn't so long ago, if someone claims that there is Flash on the Moon, often by professional astronomers of deeply into question. This report will be marked with the letter "L", meaning that a message is extremely stupid.
However, this situation does not occur again. In the past two and a half years, NASA astronomers to 100 times the Moon's surface. NASA Marshall Space Flight Center (MSFC) meteoroid environment Research Center Director Bill · Cook (Bill Cooke) explained, "they actually meteoroids explosion caused by the moon. A general power of the explosion is equivalent to several hundred pounds of TNT explosive power, using a telescope can easily capture the scene. ”
Cook to the Gaussian Tai Hang around 2008-4 January was striking video for example illustrates this point: the impact of the 2003 EH1 Comet remains. In early January of each year, the earth-moon system through a large number of 2003 EH1 Comet fragments, produces wreckage well-known quadrant pedestal of Meteor. From the Earth observation, quadrant pedestal of Meteor amphibious Flash briefly, all of the decomposition; in the absence of wind on the Moon, they hit the ground. Marshall Space Flight Center team captain Rob · Joseph Gus (Rob Suggs) said: "at the end of 2005 we started our monitoring project, before NASA announced the astronauts back to the moon. "World technology reports
Joseph Gus recalls, the first observation is that in November 7, 2005, "I will never forget the day", at that time, a baseball-sized demuynck (Encke) comet fragments hit rain sea (Mare Imbrium), had caused the explosion of the brightness of the Flash 7, Flash too fuzzy invisible, but research group used a 10-inch-diameter telescope observations.
Cook said that the people at this point in General will ask the question, "How can something exploded on the moon? no oxygen on the moon. "The explosion did not need oxygen or combustion. Meteoroid flight speed reached 3 million miles or more quickly, they will be huge kinetic energy into the moon. "In accordance with this speed, even if it is a piece of pebbles can also produce a number of explosions feet big pit. The impact of heat generated, table rock and soil heated to a temperature hot enough, that like a lava-like glow, creating a Flash. "World technology reports
In the event such as quadrant pedestal of Meteor or Perseus during the meteor shower of, when the Moon passes through the dense Comet fragments, Moon sparkle ratio up to once per hour. When the Moon left this Comet fragments, impact strength will diminish, but curiously, the Flash rate never drops to zero. Cook said, even in the meteor shower activity dormant period, we continue to see the Flash.
These "outside" impact meteor shower is a large fall in the solar system's natural space garbage. Grab the loitering in space debris and asteroid fragments of Comet has proudly to the Moon, the head is small but plentiful. The Earth was hit in the same, which is why you a night stand in the night sky and see every hour several meteoroid from head across the reason — do not need to see a meteor shower. Within a period of a year, these random or "sporadic" impact and impact of organized meteor shower is probably the number is the ratio of 2: 1. Joseph Gus said: "this is a major discovery, means that the Moon in the year are not subjected to impact, the Earth would not be subjected to impact. ”
Cook said, fortunately, the dangers facing the astronauts. "The probability of being direct impact is negligible. However, if we start building has a large surface area of the Moon skirmish, we had to carefully consider these data, bearing in mind the structure was the probability of impact. "World technology reports
Second impact is even more worrying thing. When a meteoroid crashed into the Moon, fragmentation can all loose. A shooting star experience produced by the thousands of "secondary" grains of Jet, all to the bullet-like speed flying. This is a problem, because even though the direct impact of the probability is very low, but the probability of the second impact may be quite large. Cook said: "the size of not more than 1 mm of secondary particles may be able to penetrate the spacesuit. ”
At the moment, no clear where to secondary particles scattered, loose the extent. To find a solution to the issue of policy, Cook, Joseph Gus and colleagues are simulated Lunar dust emission artificial meteoroid, simultaneous measurement of spray body. This research work is mountain view NASA Ames Research Center of Vertical Gun Range Observatory.
Meanwhile, back at the Observatory, the research team has located in mobile, Alabama, Marshall Space Flight Center's telescope from the initial one (10-inch diameter, approximately 25 cm) upgraded to two computers, one with a diameter of 14 inches (about 36 cm), one is 20 inches (approximately 51 cm). They also in Georgia has established a new observation point, equipped with a 14-inch telescopes. With more than one telescope system, researchers can Dim the Flash implementation of the second and third verification, improve the investigation of the statistical basis. Joseph Gus said: "remain in light of the moon. "In fact, in writing this report, it is observed more than three times. World Science report
No comments:
Post a Comment