mentions Hubble Telescope . We are all familiar with it. Hubble Telescope is one of the greatest cosmic telescopes of mankind so far.
It can clearly observe galaxies 13.4 billion light years away from our Earth.
But whenever we all mention this distance, we always have a doubt, since it can observe 13.4 billion light years away, why can't we see aliens?
Today we will briefly learn about Hubble.
Hubble can observe primitive galaxies 13.4 billion light years away.
So far, it has been working for more than 30 years, and has been around the earth for about 140,000 laps, and its total mileage has reached 6 billion km away. The observation tasks completed by
have reached more than 1.2 million times.
has sent back countless precious cosmic photos to us humans.
What does Hubble observe galaxies 13.4 billion light years away mean?
Everyone knows it. The propagation speed of light is 300,000 km per second.
13.4 billion light-year distance means that the galaxy that Hubble Telescope sees at this moment is the galaxy 13.4 billion years ago.
The entire universe has only been born for 13.82 billion years so far.
This means that Hubble can observe the galaxies that were originally formed by the Big Bang.
So this has led to many people's doubts. Since Hubble has such powerful functions, why can't even an alien be observed?
This has to talk about the characteristics of the Hubble Telescope, which has a diameter of only about 2.4m.
Due to this condition, even if you use Hubble to observe Proxima Centauri , which is 4.22 light years away from our Earth, it can only show a bright spot.
If the Hubble telescope is aimed at the moon, the resolution is less than 100 meters.
Please imagine, how can you see alien civilizations in this situation?
What's more, if alien civilizations evolved to use electromagnetic waves , then the means we need to detect them is not just optical telescopes, but more importantly, rely on electromagnetic waves to detect alien life.
Although the Hubble telescope can see far, it depends on the standards of our human life to find aliens.
If you want to evolve life forms like us, the corresponding planet must have a strong atmosphere.
If an alien civilization is present on a planet and is wrapped in a thick atmosphere, then imagine that Hubble telescope cannot photograph them through the atmosphere at all.
In addition, there are black holes, dark matter , nebula and other objects that hinder the spread of light.
So for Hubble Telescope, these interstellar objects are a big challenge.
Therefore, although Hubble can observe galaxies in the range of 13.4 billion light years, it cannot clearly observe the specific characteristics of a certain planet's surface.
So the best way to find alien civilizations is to use radio telescopes. Perhaps one day in the future, humans will develop more advanced cosmic telescopes.
