Getting to Space

oaky, I am lazy and unpatient when it comes to FSX. I downloaded the Nasa Valkyrie and I use it to go to space. I get to a certain point and if you move the camera to spot view, you can see a blue "film". I keep going, but with no clue how high I am cuz my altimeter reset button doesn't work, and my altimeter stops at 99999. I keep going for about five minutes, but by then I tilt up, stall, and go "crashing" to the ground, sent spiralng out of control(i don't quite fall, kinda bounce around). So I quit. How do I know when I am in space, with no gravity? Is there a visual way, or do I need to fix my altimeter and go to xxxxxxx height?