Why there are other planets in our solar system?
Earth receives sunlight from Sun; in a similar way, do we receive any kind of energy from other planets?
My question is: We are dependent on sunlight, which is energy from Sun; similarly, are we dependent on other planets as well? What would happen if they weren't there?
ok, my question is very broad, my question is we are dependent on the sunlight which is energy from Sun, similarly are we dependent on other planets as well. What if they are not there.
@user804401 I would suggest you edit your question to make it more clear that you are asking what effects other planets might have on the earth, because that's actually an interesting question to ask.
I think asking what would happen if the other planets weren't there would be a much more concrete and answerable question. Why they exist and what there "significance" is are more or less unanswerable.
I'm voting to put this question on hold. There seem to be two very different questions being asked: (1) *Why* do other planets exist (which I suggest is off-topic; it *might* be a better fit for http://philosophy.stackexchange.com/ or one of the sites that deal with religion); and (2) What effect do other planets have on us here on Earth (which would be a valid question for this site).
Well without your big brother jupiter looking out for poor little earth then life on earth wouldn't be possible (most likely, but definitely not intelligent life as it has taken us millions of years to evolve to this point, and meteor collisions would increase at an alarming rate). You receive a force on your body from all the planets in the solar system and everything in the universe for that matter, but they are neglible compared to the force you feel from earth. "But Jupiter is so much bigger than earth how could its gravity be negligible?" Well the intensity of gravity is proportional to 1/distance^2 (one over distance squared) so the farther you are away from something the less gravitational effect it has on you, and earth is big enough that it is most likely the only gravitational effect your body will ever truly be aware of. However you can see the tidal effects caused by the moon. High tide low tide are created by the moon's gravity. I once heard a man say astrology (the arch nemesis of the astronomer) is based in the tidal affects on the heavy metals in one's body caused by the positioning of the planets at one's birth, which I had to admit made for a pretty convincing argument though I still don't read my horoscope.
It's likely that Jupiter's influence has protected Earth from collisions (or not; I don't know what the latest scientific consensus on that is). But your answer implies that that's the *reason* that Jupiter exists. If that's what you mean to say, then I would ask for something to substantiate that claim. Are you assuming some intelligent design behind the structure of the Solar System? If that's not what you mean to say, then I suggest that this doesn't answer the question in its current form.
You should explain *why* Jupiter was so important. This talks about it briefly.