The bands that result on the "target" screen are vertically aligned - as-are the double slits. Is this due to the slit-orientation or is it a result of the electrons moving through the Earth's gravitational field? And as two follow up questions: Has the same experiment been tried with horizontal or oblique slits and has anyone considered running the same experiment in the microgravity of space?
It has nothing to do with electrons going through the earths gravitational field. If the slits are vertical then The fringes in the pattern will be vertical and yes the experiment can be done either horizontal or vertical. There are many easy searches online that will explain this.