Searching for Extraterrestrial Life: Challenging Our Assumptions

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In summary, the focus of extraterrestrial life searches is mainly on finding liquid water and specific atmospheric conditions. Even with these limitations, it is still possible for life to exist.
  • #1
vikasj007
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well, these days, there is a special interest in searching for extraterrestrial life

but i don't understand this. all such missions are aimed at looking for Earth like conditions,(presence of water, requisite atmospheric conditions). how can we be so sure that life can survive only in these sort of conditions.

i mean, just think, it is possible that some forms of life may survive and flourish even(in fact, only) in conditions which we are assuming to be too harsh for life to exist.

just imagine, some day, some extraterrestrial form of life lands on Earth and after taking a look around, declares that this planet cannot posses life. :uhh:
 
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  • #2
i got this idea from a science fiction story, where the conditions on Earth become so bad that humans have to evacuate it and go to some other place. just as they leave, a spacecraft lands on earth. a creature comes out of it and says, YES, this is the sort of place which is fit for living.
 
  • #3
vikasj007 said:
well, these days, there is a special interest in searching for extraterrestrial life

but i don't understand this. all such missions are aimed at looking for Earth like conditions,(presence of water, requisite atmospheric conditions). how can we be so sure that life can survive only in these sort of conditions.

i mean, just think, it is possible that some forms of life may survive and flourish even(in fact, only) in conditions which we are assuming to be too harsh for life to exist.
These assumptions are based on chemistry, mostly. First, its thought that life must be carbon-based because of carbon's unique ability to form extremely complex molecules. Next, its thought that liquid water must be present because water is an outstanding solvent and provides a good medium for chemical reactions to occur in. There are other candidates, such as liquid methand, but its difficult to concieve of how life could form in it - so partially, its just that we're sticking with what we know.
 
  • #4
Well it's not nessecarily true that only Earth-like conditions will result in life but if precedence is anything it seems to work rather well on Earth. I mean if you go anywhere on this planet, practically, you'll find life (even in places not really expected). So if we find Earthlike conditions it's a good indicator, and when the universe is so huge it's nice to have a good indicator as to where to start.
 
  • #5
which book was that? sounds like a cool idea.
 
  • #6
The planet has enough to worry about. Climate change and all. If we can make this planet better then search should start again but there again looking for other planets like this one could solve problems, in a way.

The Bob (2004 ©)
 
  • #7
rocketboy said:
which book was that? sounds like a cool idea.

it was not a book, just a small science fiction story publuished in a monthly magazine
 
  • #8
vikasj007 said:
but i don't understand this. all such missions are aimed at looking for Earth like conditions,(presence of water, requisite atmospheric conditions). how can we be so sure that life can survive only in these sort of conditions.

Exploring the universe is expensive. So you go with the best bets. You could take your finite funding and spread it out to search for every conceiveable thing (thereby reducing the changes of finding anything) or focus your resources on the areas most likely to pay off.

Liquid water is the key thing being searched for because we know how important a role that plays for life here on Earth.

Specific atmospheric conditions are not nearly so critical, especially since we know Earthly life can inhabit such a broad range of conditions (aerobic/anaerobic, acidic/alkaline, high/low pressure, high/low temperature, light/dark, etc.).
 

What is the current search for extraterrestrial life?

The current search for extraterrestrial life involves a variety of methods and technologies, including telescopes, space missions, and radio telescopes. Scientists are also studying potential habitable planets and moons within our own solar system and beyond.

What assumptions do we make when searching for extraterrestrial life?

Some of the assumptions made when searching for extraterrestrial life include the idea that life elsewhere may be similar to life on Earth, that water is necessary for life to exist, and that life may be found on planets within the habitable zone of a star. However, these assumptions may limit our understanding of what life may look like on other planets.

How do scientists determine if a planet is potentially habitable?

Scientists look for certain characteristics on a planet to determine if it is potentially habitable, such as the presence of liquid water, a stable atmosphere, and the right distance from its star to support life. They also look for signs of organic molecules, which are the building blocks of life.

What challenges do scientists face when searching for extraterrestrial life?

Some of the challenges scientists face when searching for extraterrestrial life include the vastness of space, the limitations of current technology, and the difficulty in detecting signs of life on distant planets. Additionally, the assumptions we make about life can also pose challenges in our search.

What are the potential implications of finding extraterrestrial life?

The implications of finding extraterrestrial life are significant, both scientifically and philosophically. It could help us understand the origins of life and the potential for life to exist elsewhere in the universe. It could also raise questions about our place in the universe and the possibility of communicating with other intelligent beings.

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