How do we know there are other planets out there

do you mean besides earth? or do you mean besides the 8/9/10 in our solar system?

for the ones IN the solar system, we can plainly see them with our naked eyes at night and we have flown satellites past them for up close photographs.

for planets in other solar systems around distant stars, we can see the gravitational effect planets have on their suns. If the image of the star appears to "wobble" that indicates a planet

Is there any proof? Well, for one, there are thousands of pictures. Just Google "Planets". If that's not good enough for you, you have one of two options. Go buy a telescope, learn to find the planets, and view them yourself, or go back to elementary school and learn the planets.

Taken with Hubble space telescope. Any other stupid questions?
http://hubblesite.org/gallery/album/sola…

1. We've seen them
2. We've measured the effect they have on their stars when they pass in front of them
3. We've observed the effect their gravity has on their stars

because NASA sees the planets

You silly son of a bastad ***** of course there is proof you daft sod.