Since some one asked for this, and I am looking for more comments on the following I am posting it again.

This material is a cross over from the spelljammer mailing list, but since it is details about the Mystara Solar system(Sphere) I thought others here may want to add their two cents since they are more experts on mystara then others. I am also posting this to the spelljammer list.

Please if any of you have any info you want to add about additional planets please post or send them to me.
Scooby
gemjmd@kodak.com

I have also added some new material

General Layout of the Sphere/Solar System
- -----------------------------------------------------------
Sun
Mystara (with two moons) Largest of Planets(next to sun)
Small unnamed planet
Alphatia Belt(Asteroid belt - remains of Alphatia home world?)
Watash
?
?
?

Details on worlds-------------------------------------------

Mystara:
Sphere: Mystaraspace
Orbital radius: 1st orbit from sun
Type: Earth

(Side Notes)
A group of water wizards that left the Alphatia home world before it was destroyed made their way to Mystara. Here they settled in a peaceful state in the gulf of Hule. Both groups now live in vast cities, castles that are deep underwater. Hidden from their evil brethren Fire and Earth Wizards. Mystara Water Wizards: If you are playing in the Wrath of the Immortals setting After the sinking of Alphatia, then you can have the water wizards move into the now sunken cities of the Air Wizards.

Alphatia Belt -or- Cluster:
Sphere: Mystaraspace
Orbital radius: 3rd orbit from sun
Type: Earth/Asteroid Belt
Mean Diameter: ?
Length of Day: ?
Length of Year: ?
Atmosphere: None
Resources: Minerals, Plane shifting minerals
Satellites: Many
Inhabitants: Unknown

This belt is the remains from the home world of the Alphatians. Which was destroyed by their magics long ago. (In Gazetter time (2000+ years previous) AC 1001). Their world was destroyed leaving only originally a cluster of large rocks and debris. But after several thousand years the orbital track of the world created what is today known as the Alphatia Belt. The larger rock bodies contain slim air atmospheres, but little if no vegetation. If one looks hard enough through the belt they will come across the lairs of powerful wizards. These are wizards that survived the cataclysm and have since rebuilt strong holds among the debris. These are always one of two type of wizards. Either a Fire wizard or a Air Wizard.

Using added notes below:
Certain large bodies of the belt disappear from time to time and then reappear. Sages have contributed this to the original makeup of the planet which was rumoured to be able to shift between two different planes of existence.

[Side notes - has to be fit in]
Alphatia was a world apart, a special place infused with an unbalance of Thought and Energy influence. Their plane was similar to Mystara but the 'void' itself was breathable and had very strong solar currents. [qv. M1- Into the Maelstrom]

To be able fit this in, maybe we could say that the world existed on two planes at once. Sort of like that DS 9 episode where the planet phased in and out every so many years. When the Alphatians finally destroyed their world it was left on the our current plane. This would give the asteroid belts minerals that would help in gate spells and plane shifting spells?

Watash (Previously know as Landash):
Sphere: Mystaraspace
Orbital radius: 4th orbit from sun
Type: Earth/Water
Mean Diameter: ?
Length of Day: ?
Length of Year: ?
Atmosphere: Standard
Resources: Water
Satellites: None
Inhabitants: Most known races(Alphatia Water Wizards)

This was once a earth based world, but when the water wizards of Alphatia knew that the fire wizards and the air wizards were going to destroy their world the escaped. Two groups left. The first group (larger of the two) went to Landash. It was previously a low population world with little or no knowledge of magic. Mostly a technical civilisation though no where near the tech state as City of the gods. They had large castles and fortresses and such. When the water wizards arrived on the planet they were able to quickly take over using their magics. They then began raising the oceans(Yea I saw water world and I loved it!). Soon all but the highest mountain ranges were under water. Since then it has become to be known as Watash.