Traditional Culture Encyclopedia - Traditional virtues - What aviation knowledge is suitable for primary school students?
What aviation knowledge is suitable for primary school students?
2. The launch vehicle mainly uses two fuels, liquid oxygen, liquid hydrogen and liquid oxygen kerosene.
3. The orbits of celestial bodies are all elliptical, so we have two names: near-arch point and far-supply point. As the name implies, the near-arch point is the closest point of the planet, and the far-supply point is just the opposite. There are some strange phenomena involving inertia. Forget the theory. When we run to the far supply point, the speed of the spacecraft will increase, but when we turn back to the near arch point, the speed will slow down.
The well-known space telescope is Hubble, which has also taken thousands of beautiful pictures of the starry sky for us, but few planets have been found. Kepler telescope is made for planets, and it depends on the transit of the sun. It is generally understood that the planet covers its star. Although the brightness change is only one thousandth, it can still be distinguished. At present, it has discovered thousands of planets.
The basic difference between jet engine and rocket engine is that jet engine needs air intake and cannot be used in space. Many people should know this, but jet engines are more fuel efficient than rocket engines.
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