Prophecy Questions

[Phyllis]

I'm wondering why some of the prophecy orbs are lit and some are 
dark.  Could it be that once the prophecy is fulfilled, the light in 
the orb goes out?  If so, this could be a way for the Ministry to 
keep track of which prophecies are still active.

Also, why is there still a question mark on the Harry-Voldemort 
prophecy if Dumbledore is quite sure Harry is the subject of the 
prophecy since Voldemort marked him as his equal?  If the name on the 
prophecy was changed after Voldemort attacked Harry as a baby, why 
was the question mark left on?

Also, is there a requirement that all prophecies be recorded in the 
Department of Mysteries?  Harry heard Trelawney's second real 
prediction about Pettigrew escaping and helping Voldemort return to 
power, but he wasn't asked to make a record of it.

~Phyllis