What Properties Make Earth Habitable for Life?

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The discussion centers on identifying the fundamental properties that make Earth habitable for life, emphasizing the importance of factors like the magnetic field, the presence of a large moon, and abundant liquid water. Participants highlight the significance of climate stability, which is influenced by various mechanisms including greenhouse gases and the Earth's position relative to the sun. The role of oxygen levels and the necessity for liquid water are also noted as critical for supporting life. There is speculation about the rarity of suitable environments for life, with some suggesting that the odds are extremely low. Overall, the conversation underscores the complexity of Earth's life-supporting conditions and the challenges in finding similar environments elsewhere in the universe.
  • #31
Genius of Physics said:
i knew that you would say it now my answer: evolutions says that we are coming from apes and our body and mind is becaming slowly better and better but if you think about that then we will be live in the sun after 5 billion years so believe in that or not but it is infront of your eyes and you can see that someone made bigbang, somebody says that it came from the black holes that suck up eash others and at last they explode.
My answer we will die sometime but the universe never ennd it will cycle like the water cycles the Earth and by the way how old are you i am 15. :biggrin:

You must read about evolution outside religious pamphlets. Neither Darwin nor any biologist has ever believed that we descend from apes. What evolutionary theories (there are more than one) state is that humans and apes are descendants of a common primitive ancestor, now extinct.
Evolution does not mean that things get better with time. There is nothing in the theories that presume we will be more intelligent or stronger in a million years. What evolutionary theories say is that organisms more adapted to the environment survive, the less adapted die.
Sharks and turtles have appeared on Earth before the dinosaurs and remained almost unchanged for the last 300 million years. They don't need to change since they are adapted to all the environments existent on the planet since then.
 
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  • #32
Leaping antalope said:
Oxygen and liquid water...they are essential to life on Earth.
Half right.
There are plenty of anerobic (oxygen-hating) forms of life on Earth.
 
  • #33
Brad Barron said:
I have many theroies about why life is currently on Earth. One theory that makes some sort of logical sense is that at one point, there was life on each planet, but that life on the other planets in our solar system died off leaving our planet with the most recent timeline of biological beings existing.

-Brad Barron

Theory is the wrong word; a theory is based upon evidence. Unless you know something we don't, what you have there is simply speculation. Or the plot of a sci-fi story.
 
  • #34
Wow...resurrection of a 4 year old thread back to life!

That must be some kind of record?
 
  • #35
BoomBoom said:
That must be some kind of record?

Sadly not. This thread may have conformed to PF rules when it was originally started, but it doesn't now. Thus, I am locking the thread.
 

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