This is where I get to talk about theories I have come up with concerning the story line of Sailormoon.  Keep in mind that these are only theories.  Any concrete proof would really be hard to come by. 

To date I really only have one of my own.  Any from other people will have credit given to them. If you have any theories you wish to have me post just email me.  Whether I post it or not will be my discretion but I will give each one a proper chance and read them. 

Anyway on to the first one

Sailorpluto and Sailorsaturn relation

Theory:
I believe that Setsuna was Hotaru's mother in the time of the Silver Millennium. 

Support:
Sailorpluto and Sailorsaturn seem to have the tributes of their planets mixed between them.  Compare and see what I mean. 
 

Planet Facts	Senshi Facts
Pluto is the Planet of death	Saturn is the Senshi of Death
Saturn the planet of time (the god Chronos)	Pluto is the senshi of Time (even using Chronos Typhoon as an attack in the manga).
Pluto is the smallest planet	Saturn is the smallest senshi
Saturn is the largest of the outer planets*	Pluto the tallest of the outer senshi
Saturn has rings around it	Pluto's attack has a ring like Neptune and Uranus**
Pluto has no ring	Saturn's attacks have no rings
Uranus, Neptune and Saturn are gas Giants**	However Pluto is grouped as a triad with the other two instead of Saturn

These are only some examples, there are more of them.  Ok so I have proved that their attributes are mixed.  Does this make them related?  Not specifically but it does lend to the theory because a Mother and Daughter would have mixed attributes such as these more so than sisters, couples, or other relatives. and most importantly just friends. 

Not all the attributes were switched either thus making them mixed and not switched.  Examples:
 

Sailorsaturn's earrings are little likenesses of Saturn

Chronos, the Greek god of time, carries a scythe to signify the end of a person's life, hence Saturn's Glaive and its powers of death

Sailorpluto's job has been to guard time for over a thousand years.  It is considered a lonely and barren job.  Pluto is a small planet drifting alone and barren in space.

Hades was said to be a lone god.  This is Pluto's Greek name which the story is based heavily in.

Also these are the only two senshi who have their attributes mixed together.   Naoko took in-depth time and care to make sure all the senshi had the proper attributes of their respective planets.  I would find it hard to believe this was done by mistake. 

Pluto seems to ward over Saturn through out the series.  They stick together like glue and fight together.  Pluto seems to be the primary caregiver through the manga and series (when Hotaru's rebirth father, Professor Tomoe, is not).  Even though Haruka and Michiru help but Setsuna is first in line.  Her concern for Hotaru seems to be mature and motherly even though she has never had a child of her own (that the story line has said). While the motherly nature also implies maturity it is entirely possible that it is in fact motherly. 

There is no way to truly prove this theory.  It is simply out there for you to ponder and wonder. 
 
 

*Jupiter is actually considered an "outer planet" however Naoko chose to include it as the inner part due possibly to the need to split up the planets to form the 5 person sentai team.  Sailor Jupiter is the largest of the inner senshi and I believe this is how Naoko made up for it. 

**Again Jupiter also has a ring around it but she is part of the inner senshi and I am only comparing the outer senshi since they are to some extent separate teams.  It is interesting to note though that Jupiter. Saturn and Uranus were related Gods. 

Back to the Diner