Green orb on a fast perfectly vertical descentI was driving north on Redhead Rd, Redhead, NSW, Australia, about 100m from the intersection with Oakdale Rd when an orb of light appeared directly in front of my view. It immediately descended vertically at great speed. It looked like it was around 1km in the air and was only visible from about 1-2 seconds before I lost sight of it behind a tree-lined ridge. The distance from me looked approximately 1km to 2km but it was hard to judge. It left no trail and made no sound.It was bright comparable to Jupiter or Venus when they are low in the sky and the lights colour had a green tinge to it.