But you put some lenses that capture light that was invisible to the naked eye. And you realize that what looked like a vast dark sea was actually full of galaxies and stars.
A similar thing is what NASA's Hubble Space Telescope achieved in 2012, to point its camera for hundreds of hours in a region called the Hubble Ultra Deep Field (HUDF) or Hubble Ultra Deep Field.
The observations allowed to get the deepest image of the space until that moment.
Now, scientists from the Astrophysics Institute of the Canary Islands and the University of La Laguna in Spain, led by the researcher Alejandro S. BorlaffThey analyzed Hubble data with new technology.
The researchers managed to recover a huge amount of light that did not appear before and the result is the spectacular image you see above, the new, deepest image of the Universe.
Very ancient galaxies
But what does depth mean?
"When we went to the field on a very dark night we can see the stars and perhaps some galaxies, the Andromeda galaxy is seen with the naked eye," Borlaff told BBC World.
"But our eyes are very small and we can not detect light that is very weak"
"Then when we use telescopes, which is how to use a very large eye, what we do is increase the depth, We are able to detect very weak things".
The depth may indicate older objects, the light has traveled more time to reach us, or near but very weak objects, explained the astrophysicist.
"In this case We are seeing galaxies that are very old. We are pointing to a point very, very, very far away. And there's nothing in between, so what we see is very far away. "
"Galaxies that were not" appeared
Hubble Ultrabook Field photos were taken for almost a decade and were the result of the combination of hundreds of images captured with the broad camera of the telescope, Wide Field Camera 3, during more than 230 hours.
"The goal was then to look for the farthest galaxy in the universe. Then they first had to look for the point, because the sky is full of galaxies and you have to look for a gap between them," said Borlaff.
"It's like looking at the forest and looking for a point where you have a hole in the trees to see a lot, very far, it's a very difficult thing."
Hubble has pointed during orbits and orbits to the same point, "what is it As small as the hole of a needle, if you extended the arm".
"With incredible precision the Hubble team managed to point all the images in the same place and then align them with each other."
"And when doing a combination, as an average of all these images, they reduced the noise of the final image and To appear galaxies that were not here, that were not in the original images".
"At that time the scientists were more focused on looking for far away galaxies and in this case we are more interested in seeing the diffused light that is around the larger galaxies," said Borlaff.
"What we have done is return to the original image file, And improve the combination process, "explained the scientist.
"Then, applying new techniques that have allowed us to process this heap of data, many terabytes, more accurately thanks to the technological advancement (which It has been possible only in the last five or six years), We have been able to squeeze out more data and get more information. "
"The most exciting"
The team managed to recover starlight that was lost around the largest galaxies.
The light generated by these "lost" stars It would be equivalent to having retrieved a complete galaxy.
And many galaxies that seemed to have a certain definite space nowadays are practically twice the size that was thought.
"The most interesting from my point of view is that when we see objects in the Universe as a galaxy we believe that there is a border, that the galaxy is at some point. And yet, if it continues Watching the galaxies do not seem endless, it does not seem to end there, there is no border of the galaxies".
Maybe in a few years, they're looking back at data with new technology and the galaxies "are even bigger," Borlaff told BBC World.
"Then the most exciting thing is to say," This one does not seem to end ".
"It looks like it's like a real universe you're looking for under what seemed like it was there."
"As if it were an iceberg and you would see the tip, and when you immerse yourself in the voices of a whole world."
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