The scientific knowledge that we often hear seems to be understandable, but in fact it is very confusing to understand. Today, I will take you into a scientific world. Let's interpret some scientific terms that are often heard for everyone!
Everyone knows that astronomical telescopes can be used to observe celestial bodies in our universe. But we know that the observatory is generally located on a mountain, not because the mountain is a little closer to the stars, because the stars are celestial bodies in the universe visible to the naked eye, and these celestial bodies are far away from the earth. The short distance shortened by setting the observatory on the mountain is obviously insignificant! We can understand that the earth is surrounded by a layer of atmosphere. Starlight must pass through the atmosphere to reach the Uranus Telescope. The smoke, dust, and water vapor fluctuations in the atmosphere have an impact on astronomical observations. The higher the place, the thinner the air , The less impact! The astronomical telescope we often say is a telescope for observing celestial bodies, generally an optical telescope, which has a very strong light-gathering ability and can observe faint celestial bodies. Therefore, it is possible to work at low altitudes. The higher the place, the thinner the air, the less the substances and the environment that interfere with astronomical observations, and the less the impact, which can better penetrate the atmosphere and emit signals. Therefore, most observatories are set up On the mountain!
Many people have very little understanding of black holes. When they often talk about black holes, they often imagine it as a bottomless cave! In fact, it is not what everyone imagines. Black holes are a kind of celestial bodies in the universe in modern general relativity. It has the same properties as the celestial bodies we know. The gravitational force of black holes is very large, and it can make escape in the horizon. The speed is greater than the speed of light. Therefore, a black hole is a celestial body whose space-time curvature is so great that light cannot escape from its event horizon!
When we talked about the moon, many people know that the moon is a satellite of the earth. It does not emit light and can only reflect the light of the sun. Its diameter is about 1/4 of the diameter of the earth. It rotates counterclockwise from west to east while following an ellipse The orbit revolves around the earth. What everyone doesn't know is that only half of the moon faces the earth, and the other half will never be seen!
In cosmic science, we often hear the term Big Bang. Many people think that a powerful explosion occurred in the universe at the very beginning, just like our blasting force phenomenon, but it is not the case. The Big Bang cosmology is one of the most influential doctrines in modern cosmology. His main point is that the universe had a history of evolution from hot to cold. In this process, the cosmic system is constantly expanding, causing matter The evolution of density from dense to sparse is like a huge explosion, so he is not a real explosion.
Let us explain that there are a lot of positive energy and dark energy in the universe. We often hear positive energy. In fact, dark energy is an uncommon kind of energy that can drive the movement of the universe. All stars and planets in the universe Movement is driven by dark energy and universal gravitation. If there is no dark energy and dark matter, then there is no space itself, so they are everywhere and occupy most of the mass of the earth. This is another point that everyone is not familiar with!
In fact, in the vast universe, there is still a lot of unknown knowledge we need to explore, so that I can popularize more meaningful scientific knowledge for everyone!