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New exoplanet candidate found in the habitable zone of the closest star system


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Hello!

 

As some of you might know, astronomers have recently detected (through direct imaging) a gas giant exoplanet candidate in the habitable zone of Alpha Centauri A.

 

This is the study: https://www.nature.com/articles/s41467-021-21176-6

 

For those interested, I made a video-analysis suggesting the possibility of existing a habitable exomoon around that gas giant candidate: url deleted (rule 2.7)

 

Would you prefer to have a habitable exomoon or a habitable exoplanet in Alpha Centauri?

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5 hours ago, USer2343 said:

Would you prefer to have a habitable exomoon or a habitable exoplanet in Alpha Centauri?

The closer to Earth properties i.e. mass and radius (thus closer to 1g), the better for human body. Moon or asteroid will have too weak gravitation (astronauts on ISS are suffering from too weak gravitation. To fight with it have to spend many hours per day heavily training).

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17 hours ago, Sensei said:

The closer to Earth properties i.e. mass and radius (thus closer to 1g), the better for human body. Moon or asteroid will have too weak gravitation (astronauts on ISS are suffering from too weak gravitation. To fight with it have to spend many hours per day heavily training).

You may be correct, or you may be overly pessimistic. Here are two contrary thoughts.

  • You seem to have excluded the possibility that the moon of a giant planet could not approach (or even exceed) the size of the Earth. Do you have specific research that justifies that view?
  • We have no data (that I am aware of) as to the physiological effect of gravity intermediate between the microgravity of the ISS and Earth normal. It may be that a surface gravity of, say, 0.2g coupled with regular, moderate exercise and appropriate diet would be sufficient to eliminate, or substantially minimise the negative effects. Perhaps we will have a better understanding once we've had astronauts spend a year or so on the moon.
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  • 2 months later...
On 3/1/2021 at 6:25 AM, Area54 said:

Perhaps we will have a better understanding once we've had astronauts spend a year or so on the moon

Oof.

Microgravity is devastating.

https://pubmed.ncbi.nlm.nih.gov/15887469/

Less gravity just means this detriment occurs more slowly. 

The question is how much 1g is required per day to maintain bone density and ligament strength at the attachment. As well as heart conditioning?

Since heart conditioning deteriorates despite exercising....it's unlikely there is anyway around detrimental loss of conditioning due to less gravity. 

Need centrifuges to keep conditioning. Just for how long must it be applied?

Maybe use them during administrative work

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2 hours ago, IDNeon said:

Microgravity is devastating.

While certainly having known detrimental effects over long time periods, there are allowences made for it on the ISS.

https://en.wikipedia.org/wiki/Valeri_Polyakov

Valeri Polyakov

 

Born
Valeri Vladimirovich Polyakov

27 April 1942 (age 79)
Status Retired
Nationality Russian
Occupation

Medical doctor

Time in space
678d 16h 32m

 

 

. He is the holder of the record for the longest single stay in space in human history, staying aboard the Mir space station for more than 14 months (437 days 18 hours) during one trip.[1] His combined space experience is more than 22 months

 

 

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With relation to the OP, we also have confirmed a earth size planet orbiting Proxima Centauri, the third member of this trinary system, but the furthest from the other two. Proxima Centauri is a red dwarf star. The planet has been designated Proxima Centauri b, and orbits at about .05AU. 

https://en.wikipedia.org/wiki/Proxima_Centauri_b

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