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In all the space flight missions (unmanned ones), we have send crafts from the oribit path. Have scientists thought of sending a probe, peripendicular from the orbit?

I don't mean in the directions of the other planets (like Mars and Venus). I mean going in the direction of our north or south pole axis.

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orbit is basically a circle around the planet, so perpendicular to that would be straight out away from the planet--is that what you mean? if so, the reason they don't do that is because of gravity. it's a LOT harder to go straight up than it is to go up at an angle . . .

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 misterhaan writes...

Yes, that's what I meant. Or in another word, fly away from the solar system's orbital plane.

I know it may sounds silly, but have they ever try?

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oh, you mean the earth's orbit path around the sun? i thought you meant orbit around the earth

i think the reason we haven't tried that is that we know where stuff is, and the stuff we are able to get to in any reasonable fashion is in this solar system. if we get too far away, we won't be able to receive any communication back from the probe, because the signal's power will be so spread out we won't be able to separate it from the background noise.

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Other reason might be that the rocket that puts a probe in space only gives the initial speed. they usually make few spins around the Earth to get speed and might even circle the Sun. And when they pass planets they often use the chance to get a boost. Kind of like a slingshot. That would not be possible if they immediately left the orbital plane so maybe they would slow down and get sucked into sun... and besides, there ain't much to see out there. Planets are what they want to study after all.

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I guess that make sense, about the speed and orbital slingshot. I didn't take that into an account.