Why are our planets in the solar system all on the same disc/plane/layer?
After watching this video I realized that the orbits of the planets in our solar system basically reside along a similar 'flat' plane:
Meaning that the angles of orbit are no greater than 20 degrees (if you still count Pluto as a planetary object). Why are there none of the planets at a 45 or even 90 degree orbit (in relation to the earth)? Is this due specifically to the gravitational pull from the Sun?