You can adjust the speed of the spacecraft (blue line) by using W for a prograde burn and S for a retrograde burn. Maybe you can make it to the moon. When you do, slow down to get into lunar orbit. I haven't tested that yet though, so good luck. If there's anything wrong report it to me in the comments :D
I'm testing gravity for my summer project this year. I'm also no longer going to be testing this version on scratch, it is going to be mainly in development on Roblox from now on.