On October 9, U.S. satellites hit the moon twice, claiming to have detected water on the moon in one

Recently, a spokesman said that so far, no evidence of ice has been found.

By observing the material that was knocked out and measuring its spectrum, they should be able to know its elements, and whether it is water or ice.

Scientific research is an exploratory process, and there are always the unexpected (often the unexpected will drive the development of science), and the data will be analyzed, and the preliminary release is scheduled for December!

The LCROSS satellite tracks and shoots in real time, and the spectrometer it carries can also analyze the dust and look for traces of water, salt, and water-containing minerals.

The U.S. Surveyor 1 also landed peacefully in the stormy ocean, not far southeast of the former Soviet Union's Luna 9.

The US "Surveyor" probe weighs between 1 ton when it takes off, and the lunar module weighs about 280 kilograms. For example, Surveyor 3 carried a special small excavator for lunar surface sampling, in addition to a television camera. After it landed on the surface of the moon on April 19, 1967, according to the order of the ground command, the first artificial ditch was dug in the "Zhihai", which was 20 centimeters deep.

The excavated lunar soil was sent to the lunar module for testing and analysis. A week after landing on the lunar surface, Surveyor 6 rose 4 meters high from the lunar surface again under the command of the ground, moved meters, and landed on the lunar surface again 8 seconds later. "Surveyor 7" measured the distance between the moon and the earth with an error of only 15 centimeters by laser, with an accuracy of 4 parts per 10 billion!

If you use it to measure the distance from Nanjing to Beijing, the error is within a hair.

After nearly four months of flight, the U.S. Centaur rocket and lunar crater observation and sensing satellites hit the south pole of the moon one after another on the 9th to look for clues to the existence of water ice under the lunar surface, but the flash phenomenon expected by NASA did not appear as scheduled. NASA says it will take weeks to confirm whether there is water on the moon.

"Hit the moon as promised."

At 7:31 a.m. ET (19:31 p.m. EDT), the Centauri rocket first hit the Kebbs crater at the moon's south pole at a speed of about 9,000 kilometers per hour. The Centaur rocket is the second stage of the launch vehicle that launches the lunar crater observation and sensing satellite into space. More than 4 minutes later, the crater observation and sensing satellite also hit the moon "as promised".

Images are not returned in real time.

NASA previously said that after the Centaur rocket weighed about a ton hit the moon, it should have kicked up dust up to 10 kilometers and a flash of light about 30 seconds long, but after the impact, the flash did not appear as expected, and the probe did not send back images in real time.

An hour after the moon hit, astronomers at the Palomar Observatory near San Diego, California, said they had observed two impacts with a 200-inch telescope, but had observed no signs of dust from the rocket impact. Some astronomy enthusiasts who got up early that morning to enjoy the moon collision were also disappointed, not knowing what was going on, and even thought that the moon collision was a bit "anticlimactic".

NASA said that the moon collision did occur, and the Lunar Crater Observation and Sensing Satellite scientific team is conducting a preliminary evaluation of the relevant data.

In addition, NASA** says that a moon collision will have a similar impact on the moon as an eyelash falling on a jet plane, so there is no need to worry about the moon changing its orbit or hitting a space boulder on Earth. According to NASA, the Moon has been struck four times by space rocks in the last month.

Confirm the acquisition of lunar collision data.

NASA held a press conference on the 9th to announce that the observatory under the agency had obtained data on the lunar collision.

This confirms that the Moon is hollow!

Since the first cosmic velocity is g*r under the root number, it is concluded that the first cosmic velocity of the Moon is kilometers per second, which is less than 2 km s, and the average velocity of water vapor molecules is 2 km s, so the water molecules can escape from the surface of the Moon, so d is correct. A is also correct. I don't know if it's multiple choice.

In fact, the moon collision is a well-designed lunar collision orbit, and the orbital plane is basically perpendicular to the lunar orbit around the earth, so it is installed at one end, because the speed of the impact is the maximum, and the satellite has not entered the so-called orbit around the moon at all.

Only A can be selected for this question.

By decelerating, the centrifugal force is reduced, and the gravitational pull of the moon can pull the satellite towards the moon. If the satellite accelerates, the satellite will flee from the moon.

About CD items.

The motion of water molecules is Brownian motion, which is a random motion, so the term "velocity" is used rigorously, not velocity, which means that the water molecules may move away from the moon at one moment, but more often than not, they will move in other directions. In addition, even if the velocity of water molecules in a certain direction reaches 2 km s or even more, their travel distance is generally very short, generally no more than 1 mm. Therefore, this high-speed movement of the water molecule is not enough to make it escape from the moon.

In fact, the Earth's atmospheric moisture (including water molecules) is moving at a speed of kilometers per second, but it is not fleeing the Earth.

My personal opinion is that there are two main reasons:

Water is the source of life, and the establishment of a lunar base and the survival of astronauts on the lunar surface will depend on water in the future, the purpose of which is to confirm whether there is water on the moon, so as to further explore the reserves of lunar water;

Water is closely related to the magmatic evolution of the moon and the origin of life, so the second purpose should be to understand the evolution of the moon, whether the moon used to have water, and if so, why is there no sign of the evolution of life?

If you don't give any points, who will worry about you?

According to the relationship between the quality deficit and the cavity loss and the quality and energy, it can be seen that the nuclear energy released by the nuclear reaction in the side hall is as follows

e=（4mp2memα

C2 is substituted into the value of Qinqi, and the solution is: e=

J A: The nuclear energy e released by one of the above reactions is J