Why does the moon's gravity only attract seawaterThe moon's gravity didn't just attract seawater. The moon's gravity had an effect on all objects on the Earth's surface, but the seawater showed obvious tidal phenomena because seawater was a fluid, and it was easier to flow and gather under the effect of gravity.
For solid parts of the Earth, the moon's gravity would also have an impact. For example, the solid Earth would also produce a small tidal phenomenon (solid tide). However, because the shape of the solid was relatively fixed, it was not as easy to flow and distort as seawater, so this effect was not as intuitive and obvious in seawater. In addition, the atmosphere would also be affected by the moon's gravity to produce tidal phenomena (atmospheric tides). However, due to the characteristics of the atmosphere itself and other complex factors, atmospheric tides were not as obvious and easy to observe as ocean tides.
Luhan GravityIn the reference materials, there was a mention of Lu Han's relationship with gravity. It was mainly said that his bones were not enough to support his skin for a long time. He could not resist old age and easily could not hang his face that collapsed under gravity, resulting in loose skin, collapsed face, easy wrinkles, etc. There was also a mention of his repeatedly escaping gravity when performing movements, but his hairstyle was still not messy, and other teasing content.
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Gravity OneThe Gravity-1 commercial launch vehicle was developed by the private commercial aerospace company Dongfang Space and took three years to complete. It was a medium-sized launch vehicle with an all-solid strap-on three-and-a-half-stage configuration. The rocket was 29.4 meters high, with a core diameter of 2.65 meters, a take-off weight of 405 tons, a take-off thrust of 600 tons, a low-Earth orbit carrying capacity of 6.5 tons, and a 500-kilometer sun-synchronous orbit carrying capacity of 4.2 tons. It could meet the requirements of satellite constellation networking and rapid response launch of medium and large-scale aerospace payloads.
On January 11,2024, China's Taiyuan Satellite Launch Center used the Gravity No. 1 Remote Commercial Launch Vehicle to successfully send three satellites, 18 - 20, into orbit. This was its first flight mission.
The engines of Gravity One were all from Shaanxi, and the seven high-thrust solid rocket engines were all developed by the Fourth Research Institute of China Aerospace Science and Technology Corporation. It used the first all-solid binding technology, which greatly improved the carrying capacity of the rocket. Its core was connected in series with a three-stage solid engine, surrounded by four solid boosters.
Although it was the world's most powerful solid rocket, its engine did not reach the highest level of the world's solid rocket engine. The first-stage engine thrust was 255 tons, which was smaller than the thrust of a single engine in the United States, European Space Agency, and India. Its thrust-to-weight ratio was about 1.5, and its low-Earth orbit transport capacity was only 1.63%. It was not only far lower than liquid rockets, but also lower than the world's more advanced solid rockets. However, it used four boosters in parallel to avoid the processing difficulty caused by the solid rocket engine to increase thrust. Moreover, its relay method was special. Although it looked like a three-and-a-half-stage configuration, it was actually a four-stage relay. This greatly reduced the height of the rocket, avoided the appearance of slender bodies, and made the launch safer. It was also suitable for maritime transportation and launch.
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