First, we must recognize that although modernists and astrophysicists do a lot of theoretical work, including AbstractMeth, at its heart, astronomy is a field of inquiry that arose from the observation of the night sky. As we have done for centuries, astronomers tried to look there, and make sense of all these events that we can see. So how do we see them? Of course with binoculars. They were invented around the time of Galileo, and were as powerful as a pair of binoculars, which you can get at the store. But over time, these devices became more powerful, with larger and larger mirrors to collect and focus light, so that we would mix objects that are farther apart, as long as these devices were in a house Do not grow as big. But there was always a big limit. From the surface of the Earth, we can only see the percentage of space that surrounds us, and we have to see it through the atmosphere, so our viewpoint has always been somewhat fuzzy and constrained, especially the wave of light Absorbing particles by Purvanchal atmosphere conducting longitudinal. If only we could have put a telescope into space! Well, actually, we finally did it.
But that was not the first thing we put in the class above. Currently there are more than a thousand active satellites around the Earth. We artificially ask them to distinguish them from supernatural objects, such as the Moon, which is the natural satellite of the Earth, and artificially much closer than the Moon. So what are these things? How did we get them there, and what to do? The first satellite was launched in 1957, Russian Sputnik 1 orbit, and it was radio antennas with very small metal shells. This led to the Space Race, which was part of the Cold War between Russia and the US, based on the fear that Russia would hold weapons in space to attack the US. Born out of this fear was aeronauticalization, which led to both the moon landing and thousands of satellites being spied to do science. So How far are these things? Well satellites can orbit many types of obstacles from the Earth. Is a low-Earth orbit. This means a surface of about two thousand kilometers.
The objects here rotate very fast on the earth, in about two hours or a little less. This is where the International Space Station is located, so all the manned spacecraft that have been there so far have been in the Low-Earth Orbit, except for humans on the Moon. So how do these things stay there instead of falling on Earth? This is not because there is no gravity. In truth, gravity is almost as strong in low-earthquakes as on the Earth’s surface. The reality is that these things are falling on the earth. It is simply that they are moving so incredibly that they fall to the earth at the same rate at which the curvature of the Earth arises, always falling but never descending. This is why astronauts experience weightlessness, as they are literally in freefall. Objects passing very close to the Earth revolve very fast, at least eight kilometers per second. But the more distant objects meet the Earth, the more slowly they can orbit and maintain, so the orbital velocity and orbital radii are proportional. If we go a little higher, then there is a moderate earthquake. It has about thirty-six thousand kilometers above the earth, between two thousand objects. Objects located in the middle of the region around the Earth
Therefore we call it geostationary orbit. Objects revolve around the Earth during Earth’s rotation, so they always point to the same place on Earth. So how are each of these orbital distances? Low-Earth orbits are the cheapest, and provide for communication with very short time intervals, as light can bounce back in a small fraction of a second. Also, since they are so close, they can portray the surface very effectively, so we can get some great pictures. But they move so fast that they are always in different parts of the earth. For this reason, it is usually the case that a network of satellites will be deployed to carry out any task. Low-Earth orbit environments are crowded with objects, resulting in a large amount of debris. This can be very dangerous, as the probability collision becomes too high, given the incredible orbital velocities, would be destructive to any structure and certainly fatal to any human on the way.
For observations about navigation, communication, and geological phenomena that are best viewed in a way. And finally, the advantages of a geostationaryorbit are very obvious, as it allows a satellite to be directly above the Earth at all times. The satellite orbits the same velocity as the Earth. The best thing about it is that the Earth communicating with that satellite has nothing to do, it only points directly at the satellite and never speeds up, receiving a continuous broadcast information. These satellites are usually for communication, broadcast or weather observation, and the possibility for such devices is science-fiction writer, Arthur C. It was first proposed by Clarke. No more than three such satellites are needed that provide coverage for the entire world, so this application is really useful. And with that, we have a better understanding of one of the most amazing feats of human technology.
We are able to collect data in sophisticated instrumentine orbit around the Earth that is impossible to obtain here on the surface, including a wide variety of telescopes. Of all these space telescopes, which collectively electromagnetic radiation from all regions of the spectrum, the most famous isprobably the Hubble telescope, which is free from the limitations of instruments connected to Earth, has produced some of the most amazing images ever taken Has collected. These are images of distant galaxies and other objects that previously appeared in empty space. What do these images tell us, and who is Edwin Hubble, for whom the telescope is named? To discuss this is to learn about dramatic changes in the field of astronomy and cosmology in the 20th and 21st centuries, so now let’s start talking about this further.