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Is there life elsewhere in the universe?
DW (English)
Follow
2/13/2025
The universe is filled with countless stars, making the odds of life beyond Earth high. And we’ve already found planets that could support it.
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Transcript
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00:00
How likely is it that life exists elsewhere in the universe?
00:11
In the part of the universe that we can observe, there are an estimated one quadrillion stars.
00:18
And many stars have multiple planets.
00:22
So the chances of life existing out there somewhere are pretty high.
00:31
We know what life needs to develop from studying life here on Earth.
00:36
Many factors need to come together for life to emerge.
00:43
A constant source of light from the sun over billions of years helps create a stable environment.
00:50
Our Earth orbits at just the right distance, far enough for liquid water to exist on its
00:57
surface, which is the most important condition for life as we know it.
01:03
The area around a star in which life could be possible is called the habitable zone.
01:09
In our own galaxy, the Milky Way, there could be hundreds of millions or even billions of
01:14
habitable planets.
01:18
Some distant planets and habitable zones have already been found.
01:23
Some are even categorized as superhabitable planets, meaning their conditions could be
01:28
even better for life than Earth's, and they would have had more time for life to develop.
01:35
But we don't know yet whether there's actually life there.
01:39
These planets are too far away from us to study in detail.
01:47
The James Webb Space Telescope is already searching exoplanet atmospheres for signs
01:52
of life.
01:56
In 2026, the PLATO telescope will begin studying planets as they pass in front of their star.
02:03
And in Chile, the world's largest telescope will soon go into operation.
02:09
Astronomers hope that the extremely large telescope will allow them to study exoplanets
02:14
and habitable zones for the first time.
02:19
Even within our own solar system, there are places where life in theory could exist.
02:24
Europa, one of Jupiter's moons, is a top candidate, along with Enceladus, a moon of Saturn.
02:32
And there could even be life on our closest neighbor, Mars.
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