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Evidencia de vida en otro planeta
A24
Seguir
17/4/2025
Señales captadas por el telescopio Webb marcan que puede existir vida en el universo, más allá de la Tierra.
Categoría
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Noticias
Transcripción
Mostrar la transcripción completa del vídeo
00:00
Gracias.
00:30
We have found evidence for possible biological activity on an exoplanet.
00:37
We have found signs of biosignature molecules, either DMS or DMDS or both,
00:45
both of which are produced uniquely by life here on Earth
00:50
and have been predicted to be biosignatures on planets around other stars as well.
00:55
And we found the strongest evidence to date on a biosignature molecule,
01:02
in this case a combination, potentially around another star outside the solar system.
01:08
And that is a major breakthrough in our search for life beyond the solar system.
01:18
Not only that there is a chance that the planet can actually be habitable,
01:24
but what we are finding is that we are demonstrating that it is possible to detect biosignatures
01:32
in atmospheres of such planets around nearby stars with existing facilities.
01:38
And that's a big breakthrough.
01:54
Currently, the only scenario that explains all the observations, in other words, detections of methane and carbon dioxide,
02:10
non-detection of ammonia and carbon monoxide, and now possible detection of these molecules,
02:15
means that based on our current understanding, the only scenario that explains all of this
02:20
is one where it's a Haitian world that is teeming with life.
02:24
And what is a Haitian world? It's an ocean-covered surface with a thin hydrogen-rich atmosphere.
02:30
And the ocean being habitable.
02:32
So that is the only scenario which can currently explain all the observations together.
02:36
However, we want to remain open to other alternatives one might come up with in the future.
02:42
This moment in history of science will be viewed as a paradigm shift in our search for life.
02:53
And the reason for that is that we have breached the level where we are demonstrating that if there is life out there,
03:01
if there are Haitian worlds out there, these ocean worlds with hydrogen atmospheres with life on them,
03:07
we are basically establishing here that we can detect that kind of signature,
03:13
those kinds of planets and biosignatures in them.
03:17
So that is a paradigm shift in our understanding.
03:20
This is a monumental discovery. It is very important, but we also have to be extremely cautious.
03:37
The reason is that this is one of the biggest questions we have asked as a species in all of science,
03:42
and we have to deal with it very carefully in that we want to be really, really robust
03:47
in establishing whether this is actually life that we are seeing.
03:50
We want two things. We want more observations to confirm that the signal is robust.
03:55
We are seeing it at a three sigma level.
03:57
We still have three in a thousand chance of it being a fluke.
04:00
So we want to observe more to get it to a five sigma level, less than a chance in a million,
04:05
a part in a million of a fluke.
04:07
But we also want to do more theoretical and observational studies to make sure
04:13
that there is absolutely no other way we can make this molecule without life.
04:17
I think it is our responsibility as scientists and as part of a society
04:22
that we want to answer this very deep question in a very careful and robust manner.
04:26
But the excitement is still there nevertheless that we've got the capability to do it now.
04:37
Thank you.
05:01
Gracias por ver el video.
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