Human science and technology are constantly developing and improving. People’s understanding of the universe is constantly deepening. With the advent of radio telescopes, human vision has made a qualitative leap. Depending on the telescope, the scope of our human observable universe has reached 93 billion light years away.
If we take a spaceship and go to a planet 4.5 million light years away, where we set up a telescope and look at the earth through a telescope, can we see the origin of humanity 4.5 million years ago?
In theory, it is ok, provided that the universe is a true “vacuum”. As long as the universe reaches a vacuum in the true sense, it means that we can see the sight of the earth 4.5 million years ago, because it encounters resistance. At the same time, the light will be worn out (similar to the loss of data during the transmission of information).
First, observing the Earth 4.5 million light years away, the light is passing from the earth to our position. This spans 4.5 million light years. That is a very long distance. During this crossing, there will be many obstacles. These obstacles will lead to data loss in the light.
For example, when the light passes through the nebula, the dust inside the nebula will block the light. The dust will cause the light to scatter when it passes through it, causing a part of the light to scatter into the boundless space. Finally, Disappearing into the cosmic universe, this is one of the reasons for the incomplete light.
In addition, when passing through a huge celestial body, it will also have an impact. The phenomenon of time and space distortion will occur around the oversized celestial body, which will cause distortion or refraction of the passing light, etc. This in turn causes the loss of some of the light information.
The other reason for incomplete light is a black hole. We all know that as long as the size of a black hole is large enough, the accretion disk becomes large too. Once the light is close, it will be sucked in. When the light disappears into the blackhole, it will not be able to reach us.
If it is a small original black hole, there is no need to worry. A small black hole will not devour the substance, and will not devour the light. For black holes, we still don’t know whether a black hole is a physical object or a gravitational space. If it is a physical celestial body, part of the light will be blocked. This in turn leads to loss of some information in the light.
Therefore, if we observe the Earth at a position 4.5 million light years away, we can see the Earth’s historical form. (4.5 million years ago) However, it may not be clear. This is because some information is lost during the transmission of light. Moreover, we must also have a spaceship traveling at a speed of light.