Yes, as Vaumnou noted, 65535 is an unsigned short. I of course cannot provide a definitive answer, but with my knowledge of SpriteWorld, and some deduction, an informed guess is possible.
First, SpriteWorld, in un-modified form, will hold the dimensions as signed shorts. So, if you start in the middle of the system, you will have 32767 pixels on either side of you. I am going to guess that mburch didn't change this.
This can be confirmed by looking in the spöb resource. The xPos and yPos fields are DWRDs, meaning they are shorts. So, even if the Nova engine was changed to use longs, you can only place a planet within the range of a signed short.
Furthermore, traveling 2.1 billion pixels (the width of one side if dimensions were signed longs), would take a huge amount of time. Since a lot of people have had the experience of being wrapped by the engine (and in my experience it doesn't take all that long to do so) it is highly unlikely they all spent the time traveling 2.1 billion pixels.
Edit: Vaumnou's guess of 21 million pixels is possible, but traveling that far would take a while as well.
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(url="http://"http://www.ariossoftware.com")Arios SoftWare(/url)
(url="http://"http://www.ariossoftware.com/programs/evone/")EVONE 1.0.0 - the plugin editor for EV/EVO/EVN(/url)
(This message has been edited by AriosSw (edited 04-26-2003).)