Gleaming white smooth low flying egg over Woodbourne, Blenheim, New ZealandI was on a bus with many other members of the Takaka Citizens Band on the way to a competition in Blenheim. I noticed in the sky a fast moving aircraft flying fairly low maybe 700-1000 metres up in a NE direction about a couple of kilometres away. At first I thought it to be a Lear jet but whilst looking at it intently realised it had no wings and was the shape of an egg, gleaming white in colour and no protuberances, of any sort with it's pointed end facing the rearward direction to which it was travelling. I remarked on it to two girls who were behind me to verify what my eyes were seeing and asked 'does that thing have any wings?' they both couldn't see any wings and then I said 'what the hell is it then?' upon which one of them remarked 'it;s probably just a blimp' at which they continued with their teenage girly talk thinking nothing more of this odd craft travelling at what appeared to be a supersonic speed in the sky, there was no trail or exhaust emmisions. I lived for a long time near Wigram airport in Christchurch and had seen jet fighters on maneouvres travelling through the sky at supersonic velocities, domestic passenger jets, helicopters etc. It certainly to my mind was not a blimp for it contained no undercarriage and was travelling extremely fast, at a guess around Mach 1 or slightly more? I watched it for the next minute disappear into the distance travelling in a perfectly straight line towards and beyond Blenheim's Woodbourne airport, it did seem to accelerate a little. It was a perfectly clear day and I had good reference points of the hills south of the main road. It appeared to be about the size of a Cessna aeroplane in length or perhaps a little longer.((NUFORC Note: Date of sighting is approximate. PD))