"I like the questions posed in this blog post. It is an interesting topic to consider, as it is easy to assume intelligent alien civilizations will be similar to us, because humans are all we know. You could also discuss how the similarity of…"
"This is an interesting perspective on the topic. I do believe that the initial motivation for humans to travel into space was curiosity, but now it may be more of a necessity. Climate change is causing the Earth to slowly become uninhabitable and…"
The largest sample size that we know of life is here on Earth. Rather than looking for anything possible on other planets/moons, it is beneficial to start with the things that we know life cannot survive without on Earth. It is also important to consider what we are most likely to find. Due to the large timescale, it is possible that we will only find what is left of an alien civilization. It is also highly probable, that we will find microbial life rather than intelligent life. These things…See More
"I liked this post because It taught me a large amount of information in a short time frame. Differences between eukarya and archaea, once thought to be very small, are larger than scientists initially believed. This post could have used some more…"
"I like how this posts covers both theories objectively, and does not give an opinion until the very end. This allows the reader to make up his/her mind before being told by the author which perspective they believe more in. I do disagree that the…"
"I read somewhere that HGT can still happen in bacteria. I can't remember where i found this, if I do I'll leave a link. I think that HGT was the primary form of gene transfer in early life. I think that if chemicals were being passed…"
There are two types of ways that cells are able to transfer genetic material. Horizontal Gene Transfer (HGT) occurs between organisms that exist at the same time, and does not involve reproduction. Vertical Gene Transfer (VGT), is known to be a key part of Darwinian evolution. Parent cells pass down genetic material that leads to phenotypes being observed in child cells, rather than genes being transferred between non related cells.Simple organisms exhibit HGT more than they do VGT, and once…See More
"I totally agree that our knowledge of life is very limited due to earth being the only planet we know that hosts it. You can’t really define what life is because it could literally be anything for all we know, but if we do discover…"
"I like how you brought up that Earth, many different types of life, is only one small sample size compared to the whole universe and that our sample for life could be completely different than another sample that might be out there.
"I like how this post talks about different interpretations for the definition of life, and compares and contrasts their distinct differences. This post could use the addition of discussing how our current definition of life could be updated if…"
"What I liked most about this, was that this equation is an alternative to the Drake Equation, and is more specific to the possibility and likelihood of life on a single planet, rather than how many planets total exist that can have life on them. It…"
Our definition of life only depends on what has been observed on Earth. Until we find life on another planet, or in another solar system, we are limited to observing what we know about life, only to what we have here on Earth. Simply speaking, our sample size for what life is, is limited to just one area, albeit, many different forms and species are included in this one sample of how life can emerge on a planet.It is possible that there are life forms or organisms that have emerged in the far…See More