Hacker NewsArticle URL: https://www.bbc.com/news/articles/cy4kdd1e0ejo
Comments URL: https://news.ycombinator.com/item?id=48947560
Points: 358
# Comments: 224
Hacker News 讨论
358 points · 224 comments · 查看原帖
- tulio_ribeiro
Didn't know a rocky planet in the habitable zone of a red dwarf could retain atmosphere against intense stellar stripping. Red dwarfs are known to be cooler (the habitable zone is therefore closer) and unstable. I don't think LHS 1140b is "Earth-like" at all. Rather, it's more like a mini-Neptune, being boiled off by its star. Edit: JWST emission spectroscopy of LHS 1140b as it passes behind its star rules out a mini-Neptune. https://arxiv.org/abs/2406.15136
- mekdoonggi
We should build a solar lens telescope. By the time we're ready to use it, we'll have a bunch of candidates to point it at.
- smb06
I feel like I've been hearing about atmosphere on Earth-like planets for a while. Or maybe I've missed some nuance.
- tsoukase
I think we should focus at the solution of Fermi paradox, especially the short time window factor. Life on earth evolved for billions of years, while one of it's creatures is capable to receive/send messages to space for only 50. That leads to a factor of billions/50 reduction at the calculated probability of alien life discovery. Multiply that with another billions/xxx at the receiver side, if they are similarly able to communicate for only a few centuries at best. I assume you agree that our and their evolution are independent. So the new probability becomes quite low, which fits with our (non-)observation of alien life. We might not be alone, but we are far away and very short lived.
- jimbokun
48 light years is in our back yard. Close enough that we could probably develop a probe to get there in the next few centuries and check it out. What are the current popular candidates for propulsion systems capable of accelerating to near the speed of light?
- kevthecoder
Related/dupe: https://news.ycombinator.com/item?id=48939742 (45 comments)
- jenova-marie
I'm a bit upset with Science for their current wording of things. "Super Earth"??? Really, what you gonna find out there that's more super than what we have here? I get that super is more a reference to their size, but really? RESPECT OUR EARTH and don't label large rocks rotating around some distant star more super than what we have right here! I hate that term, it's offensive. I also feel science has it totally wrong with "looking for life on other planets". I find that an insult in not acknowledging that it's the PLANET ITSELF THAT IS ALIVE. Science will never find life on a dead planet, so make that clear. Science should be looking for "Planets that are alive". Sorry OP, this has nothing to do with your post.
- waynecochran
| The gas detected in the atmosphere is helium The planet must have an enormous escape velocity to contain helium in its atmosphere. If there is life there they are stuck.