387 posts, How can you tell if a planet has or had life on it? It all depends if scientists can estimate the two following things about a planet?

     First is the gravitational forces, of the planet. the strength of the gravity of a planet will tell them if the planet in question should have maintained its atmosphere since it was first formed. The second thing that scientists need to do is calculate the density and makeup of the planet's atmosphere. There is little reason to believe that how our own solar system was formed should be much different, than any solar system in the universe? I would even go so far as to speculate that because gravity is what causes matter to come together and form Stars, planets, asteroids, and meteoroids, and it is perhaps just chance on when and where material gathers on what is the end product. Yet, the resulting solar system will still end up with the star being at the center with all other material being guided by the massive gravity that the star has.                                                 Again there is no reason not to think that what elements were around when solar systems were formed, would differ in any great way so the resulting elemental make-up of planets and their resulting atmospheres, should also remain somewhat constant. In our solar system, carbon dioxide has always been the leading molecule in the atmosphere of smaller-sized planets where gravitation could not long keep helium and hydrogen, from being stripped away from the atmosphere.                                                                                       Carbon-based life is then what would end up being the leading reason, for the removal of carbon dioxide levels in the atmosphere of a planet. This leads us to speculate that what levels of carbon are in a planet's atmosphere would be a good indicator of past or current life. Dan

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