"HD 20794 d, (82 G. Eridani d ) a planet six times the mass of Earth, orbits a Sun-like star just 20 light-years away. Its presence was confirmed after years of meticulous analysis, overcoming the limits of detection technology."(ScitechDaily, A Hidden Planet Revealed: Could This Be One of Our Best Chances at Finding Alien Life?)
"Although it lies in the habitable zone, its elliptical orbit presents challenges in determining its true potential for life. Future telescopes may soon provide deeper insights into its atmosphere, making this one of the most exciting exoplanet discoveries in recent years."(ScitechDaily, A Hidden Planet Revealed: Could This Be One of Our Best Chances at Finding Alien Life?)
The new planet is interesting. Because it orbits stars similar to our sun in 20 light years away. That planet is in the habitable zone. And that can be the best candidate for extraterrestrial lifeform. The planet HD 20794 d is not in the habitable zone all the time. That planet's trajectory is very elliptic and it orbits around its sun HD 20794, known also as 82 Eridani. That star is quite similar G-type star as our sun. The star is a little bit colder than our sun, and the exoplanet HD 20794 d has a mass six times Earth's. That means that big exoplanets can have habitable moons. The exoplanet HD 20794 d is the thing that should make us think about life in the universe in new ways.
"The orbit of HD 20794 d places it within the habitable zone of the HD 20794 system, meaning it is at the right distance from its star to sustain liquid water on its surface. Credit: Gabriel Pérez Díaz, SMM (IAC)" (ScitechDaily, A Hidden Planet Revealed: Could This Be One of Our Best Chances at Finding Alien Life?)
"Size comparison between Enceladus (lower left), the Moon (upper left) and Earth) (Wikipedia, Enceladus).
Can icy oceans on icy moons host life?
Things like cells are a thing that makes life on Earth possible. The cells and DNA can form millions of different types of organisms. Woods, bears, and fishes live on the same planet with sea anemones and bacteria. Those creatures have only one thing that combines them. They all have a similar cell structure. And they all live on the same planet. Same way we cannot close out the possibility that some other planets can support life that is totally different than life on Earth. Cells and DNA double-helix molecules don't mean that lifeforms on distant planets are similar to life on Earth.
"A model of Titan's internal structure showing ice-six layer" (Wikipedia, Titan)
"Size comparison: Titan (lower left) with the Moon and Earth (top and right)" (Wikipedia, Titan)
Once astronomer Carl Sagan introduced an idea about theoretical living bubbles that live in the gas giant's atmosphere. Similar living balls can also hover. In the low-gravity moons like Europa and Enceladus moon oceans. Those living balls are only one early hypothesis of what the lifeforms can look like. We know that there is an ocean under the icy shells of the Enceladus, Europa, and other big moons. There is also mysterious methane emission on Satrurn's Titan moon.
That moon is so cold that there should not be any lifeforms. That moon should be dry without any water. But now researchers noticed. That there are hydrocarbon oceans on the moon's surface. And there is quite a big possibility. Under the Titan moon's shell, there is a subsurface water ocean. Another interesting question is how the moon whose surface gravity is 0,138g can host an atmosphere that is 1,45 times denser than Earth. The Moon's gravity is 0.1654.
There is the possibility that the longer distance from the Sun makes the Titan atmosphere possible. But Saturn's gravity is the thing that should pull that nitrogen off around Titan. The remarkable thing is that there is no free oxygen in Titan's atmosphere. But Enceladus has no atmosphere at all. The weak gravity on Titan and Enceladus can explain the liquid water under the Titan and Enceladus shells. But the methane emission is one of the most interesting things in the world.
https://scitechdaily.com/a-hidden-planet-revealed-could-this-be-one-of-our-best-chances-at-finding-alien-life/
https://scitechdaily.com/beneath-the-ice-titans-six-mile-deep-methane-crust-could-rewrite-planetary-science/
https://en.wikipedia.org/wiki/82_G._Eridani
https://en.wikipedia.org/wiki/82_G._Eridani_d
https://en.wikipedia.org/wiki/Enceladus
https://en.wikipedia.org/wiki/Moon
https://en.wikipedia.org/wiki/Titan_(moon)
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