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If we move to the moon, what is the probability of being hit by millimeter diameter rock particles?

2022-05-07 11:25:16Chinese industry information station

I'm very glad that , Astronauts who landed on the moon didn't face much risk , Their probability of being hit by a millimeter diameter object is only one in a million per hour . It is reported that , Wear the spacesuit worn by astronauts , The smallest diameter of meteoroid particles is at least 1 mm .

NASA is preparing to 2025 Send man to the moon years ago , And build a human base in the lunar orbit or on the lunar surface , therefore , It is important to understand the frequency and number of meteoroid collisions on the moon . So how many meteoroids collide with the moon every day ? How many will there be every year ?

The answer depends largely on the size of the meteoroid . Understanding meteoroid flux ( Meteoroids include space dust to a diameter of 1 An asteroid of about meters ) Can roughly calculate the average number of meteoroids hitting the lunar surface every day .

For diameters less than 1 Mm impactor , Its quantity cannot be accurately quantified , It is estimated that there are 11-1100 Tons of space dust into the moon , For larger meteorites and meteoroids , The number is clearer .

Every day about 100 A meteoroid the size of a table tennis ball hit the moon , Every year there is about 33000 Meteoroid , Although they are small , But each rock the size of a ping-pong ball can be used to 3.2 The impact of kilograms of explosives hit the surface of the moon , meanwhile , Larger meteoroids will also hit the surface of the moon , But the impact frequency is low .

Besides , Larger meteoroids ( for example : The diameter is greater than 2.5 rice ), About every 4 Hit the moon once a year , The impact of these meteoroids on the moon is equivalent to 1000 Tons of TNT Dynamite . The moon has about 45 Hundred million years of history , So it's not surprising that its surface is covered with all kinds of craters .

at present , Scientists use several different methods to study the impact of the moon , Scientists on earth can use telescopes to observe meteoroids colliding with the moon . According to NASA , Meteoroids will appear as 10-72 km / Hit the earth's surface at a speed of seconds , The flash produced by the collision can be directly observed from the earth .

meanwhile , Scientists can also use orbital probes to observe the moon , for example : NASA Lunar Reconnaissance Orbiter (LRO), Observe the craters created by meteoroids colliding with the moon . Because meteoroids move very fast , Even if it's 5 Kilogram meteoroids will also collide on the surface of the moon 9 Meter diameter crater , And impact sputtering 7.5 Million kilograms of lunar soil and rock , The Lunar Reconnaissance Orbiter can clearly observe the formation process of this level of crater from the lunar orbit .

Although the moon is hit many times a year , But that doesn't necessarily mean humans can't survive , The surface area of the moon is about 3800 10,000 square kilometers , If humans choose an area of 1 An area of square kilometers as a human base , So the probability of being hit by a meteoroid the size of a table tennis ball is about every 1000 Once a year . therefore , For future lunar explorers and space probes , The moon is full of hope !( Ye Qingcheng )

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