Lead
Originally, the atmosphere on Neptune was very thick, Neptune was almost shrouded in brownish-yellow "fog", and the wind speed of Neptune Hainas was very fast, and the wind speed could even reach 2000 kilometers per second, but in 1989, a group of scientists were surprised to find that Neptune's atmosphere completely disappeared.
And the day before, Neptune was still as good as usual, but the next day the entire atmosphere of Neptune disappeared, and for a while, scientists thought it was a sign of Neptune's disappearance, what is going on?
Neptune's atmosphere has had several twists and turns.
The wind above Neptune is very strong, 2000 kilometers per second, resulting in Neptune's atmosphere is very condensed, although Neptune is very far away from the sun, but Neptune is a planet in the end, in this extremely low temperature environment, the atmosphere will not relax, on the contrary, Neptune's atmosphere has become thicker and thicker.
And because the wind on Neptune is very strong, the atmosphere of Neptune is very thick, so even the sun's rays cannot pass through the pressure of Neptune, so humans cannot observe what is on Neptune, so people have not been very interested in going to Neptune to find out what is, after all, Neptune has no important material for the earth has no effect.
But in 1989, when scientists were observing Neptune, scientists found that Neptune's atmosphere seemed to be much thinner, so scientists were very excited to make observations, and when they observed the results, they were stunned, the entire atmosphere of Neptune was completely gone.
What's going on here?
Before we talk about the composition of Neptune, let's talk about two concepts, one is air temperature and the other is air pressure.
Air temperature is the level of heat inside an object, and air pressure is the density of the air and the force of collision between molecules, of course, air temperature and air pressure are closely related, the higher the temperature, the faster the movement of molecules, of course, the greater the collision force, the higher the natural air pressure, and the lower the temperature, the slower the movement speed of the molecules, the smaller the collision force, so the air pressure is also smaller, the temperature of Neptune is very low, only -200 degrees Celsius, and the pressure of Neptune is very large, reached 10,000 kg per cubic centimeter.
Therefore, the air above Neptune is very heavy, and scientists have previously calculated the atmosphere above Neptune and found that even the lightest hydrogen can only float at a distance of 300 kilometers, and another gas, methane, can only float on hydrogen, thus forming two phenomena: "methane sea" and "hydrogen sea".
Neptune has a temperature difference, so it rains.
The temperature of Neptune's ammonia is higher than that of ordinary ammonia, so when the gas rises, the ammonia will cool down and become more condensed, and eventually become rain, so we can think that there is a temperature difference above Neptune, and the temperature of hydrogen on Neptune is lower than that of ammonia, so how is the temperature difference on Neptune caused?
The temperature difference on Neptune is caused by the change of bearing, because Neptune rotates in the same direction, so it causes the south pole of Neptune to be in a state of night, which means that Neptune's atmosphere will inevitably be very cold, because according to the influence of different satellites on the temperature of the atmosphere, the sun's rays will pass through the atmosphere of the satellite and then shine on the satellite, but in the dark night, the air pressure will be very low, so the atmosphere is thin, The sun's rays can quickly pass through the atmosphere of the satellite and shine on the satellite, so that the temperature of the satellite will rise, and the north pole of Neptune is different, because Neptune is rotated, so the south pole and the north pole of Neptune will take turns facing the sun, but in the north pole of Neptune, the atmosphere on Neptune is very thick, so it is difficult for the sun's rays to shine on the surface of Neptune, so the temperature is very low.
Therefore, the north and south poles of Neptune form a very large temperature difference, which in turn forms an air flow of ammonia to the equator, so there is often rainfall on Neptune, sometimes ammonia falls, sometimes hydrogen and stones.
The atmosphere of Neptune will also lose part of the air flow formed by Neptune's rotation, and helium and hydrogen cannot be transferred with the flow of air flow due to their weight, so they are gathered into a cluster in Neptune's atmosphere, although helium only accounts for 2% of Neptune's atmosphere, but Neptune's mass can be relatively large, so there is a lot of helium gathered in Neptune's atmosphere.
Moreover, helium will also flow rapidly with Neptune's rotation, reaching a speed of up to 2,000 kilometers per second, which is equivalent to an adult riding on the road at this speed, it is very easy to reach the destination, and in 1989, on the highest surface of Neptune's equator, they were stunned to see a "scene".
This scene is that Neptune's atmosphere seems to have become much thinner, so scientists are excited to observe, and for a period of time in the observation, they are very excited to wait for the results, but when they detect the results, they are all frightened, they did not expect that "overnight" Neptune's atmosphere disappeared.
Neptune's atmosphere is gone.
When scientists consciously placed a model of a rocket on Neptune, it turned out that the rocket model could float freely in the air, unlike before, in order to make the rocket take off, it had to be sent high in the air with the help of the power of the launcher.
But now not only does it not use the power of the launcher, but it is also very easy to send the rocket higher into the air, which means that Neptune's atmosphere is very thin and can accommodate the rocket model floating in the air.
So, if Neptune's atmosphere disappears, is it Neptune itself that has disappeared?
Of course not, otherwise scientists would have found that Neptune had disappeared, so it can only be said that Neptune's atmosphere has become very thin, why is that?
Because the human instrument is too heavy, so scientists held an experiment, they put a paper coin on the scale together with a hundred yuan, the final results showed that the heavier banknote fell quickly, while the lighter banknote can easily be suspended in the air, this experiment confirmed the problem, the atmosphere has become a place for the human eye to "see".
Experiments have shown that a thin "layer of paper" that is almost invisible to the human eye can make a banknote suspended in the air, which shows that Neptune's atmosphere is already very thin, although the temperature on Neptune is very low, but its atmosphere is very lively, much more active than the Earth's atmosphere, so scientists use rockets to send oxygen to Neptune, and the oxygen burns up Neptune's methane, which causes Neptune's atmosphere to become very thin.
epilogue
The atmosphere on Neptune is thin, so when scientists put the rocket model on it and let the oxygen and hydrogen cylinders blow up, it will cause the entire atmosphere of Neptune to become very thin, and eventually the thin atmosphere of Neptune can accommodate a rocket model suspended in the air.