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You cant use earth based criteria/evidence to assume things about alien planets/moons
In fact, you can assume anything you want. For instance I assume that the atmosphere/temperature/pressue on Mars is identical to earth.
Although its gravity is obviously different than earths because it isnt on the same line of orbit, meaning the gravity it exerts on the sun is different.
This means that its personal gravity would be different, meaning that an atmosphere would be denser, or lighter.
If it was denser, it would be filled with gases poisonous to Earth Life?
If it was lighter, gases such as Oxygen would leave the planet, and no life could live there.
Planets are each incredibly different,
Could you please elaborate on your statement "because it isn't on the same line of orbit". I am assuming you mean orbital plane. If that is correct how does the gravity it exerts on the Sun affect its atmosphere?
Also can you tell me what your source is for the statement "it's gravity is obviously different from earth's?"
I am not sure that we understand what gravity actually is but Lazar says there are 2 types, gravity A which works on an atomic scale and gravity B which is the gravity that we are talking about.
How do you arrive at the conclusion that a dense atmopshere would be filled with gases poisonous to earth life. Specifically what gases?
I think we can both agree that there is an atmosphere on Mars. The debate is how much? I would imagine that the atmosphere on Mars is breathable and I only say that because I believe there are about 600 million people living on Mars.
I disagree. Other than size they are all the same. They all have (at least in this solar system) human life as we know it, grass, trees, cities and animals.
So, what makes you think that other planets have cultures.
More importantly, why keep it secret? Its not like we can profit from it.
Originally posted by Octavius Maximus
Actually...im no historian, not a scientist. I have a good imagination, though. You just need to visualise the universe.
What REALLY helps is a book called "The science of Discworld"
This is one of the most intelligent and rational book ive ever read, while still being incredibly entertaining.
Look into it, if you wish, it looks at the universe in terms that anyone can understand, even mine
But still, i would like to know why you believe life exists, why people would keep it secret, and which came first. The belief in life bearing planets, or life ON planets?
Erm...you might want to google "John Lear" to pick up a little background ambience and go to the link below to read some threads, happy reading.
I will take a swing at answering you OM
Tell, me, in all of your life, have you ever saw the core of the earth? Have you known any instrumentation that has gone to the core?
Now, tell me, how do you or anyone else know what the core is.
How are we certain that the 'gas planets' are really all gas?
how are we so certain that venus is so hot? we did have rovers land there and take pictures. If it was so hot, how did they manage to safely land and take pictures?
We discover new life in places we thought they couldn't exist, in forms we couldn't fathom, in the current times, on this planet ... if we are wrong about what life needs and can be here ... how can we be so sure about what life needs elsewhere.
Why would they hide it? How many people would freak out if they found out there was other civilizations out there, or other life forms that are not understood? How many people would question why we were told this couldn't exist for so long? How many people would try to drop everything to live a different life somewhere else, just for the experience and sights?
You say you have a great imagination ... well, then don't let the false rules you were taught limit that ability to see things beyond the boundaries you have learned.
Remember, a lot of science is theories and repeatable results. Just because one set of results are the same, doesn't mean it is the only possible result.
Again, life doesn't necessarily need oxygen either. We do. Technically, our plants do to, since, oxygen is a component of CO2. BUT, to assume all life in all existence would need the element oxygen ... would be quite arrogant and assuming. The fact is, to some creatures, oxygen could be like bleach is to us.
Now think about that ... oxidation destroys metals, right? Well, what if some life was metallic based? Far-fetched you say? Not really, we have metallic elements in us, in fact, we require some to be healthy. So what if some organism were actually reversed, to where they were mainly metallic vs our organic nature? When you realize everything is just a grouping of various elements, then, you realize ANYTHING is possible.
The distance from the sun does not affect the planet's gravity to its residents. The mass of the planet or moon does ... yes, other bodies can also have an effect, but, to what extent? Do you feel lighter on the days/nights the moon is directly above you vs the days/nights the moon is directly below you? No? Then it shows you how little a large body can affect your planet's individual gravity on its inhabited objects.