This format is great for maintaining decent happiness and great amount of Spice production!

In Space Stage, you can find Solar Systems controlled by a Civilized Sentient Being.
These Beings will make heaps of Spice in little time or none!
And stealing it wont anger these cities At All!
But, be warned! These Civilized Beings wont stay Civilized long! They will soon degrade back into Tribal Stage! So, keep some T3 Planets with you just in case!

Based off this chart, there is a high probability to have Blue, Green, Purple, or Pink Spice on Blue Solar Systems. These are the rarer forms of Spice, so they sell higher than any other spice. Use this chart and your eyes to spot bright blue stars to get the spice you want.

But there are variables that are Mandatory to selling Spice at a high price!
Variables like:

• How much you've sold.
  
• Where Spice is on nearer Solar Systems.
  
• What kind of Spice.
  
• Type of Empire.
  
• Trade Route

If you sell large amounts of spice to one Empire, the price will drop dramatically!

If an Empire is surrounded by very few Pink Spice induced Solar Systems, they sell higher!

If the Spice is one of the rarer ones (Ex. Green Spice). Then, it'll sell for a higher amount!

If the Empire you're selling the spice to is a Trader Empire, then prices will be low.

If the System is in a trade route with you, spice will generally sell higher.

• Happiness doesn't always need to be at full for Citizens to not Revolt! It can be at 3/5 happiness.
  
• The Grox don't sell... Ever. So don't ally the Grox without any friends!
  
• It is advised to go economic in Civilization Stage, as this will give you Spice Savant! This increases Spice Productivity, making you more persistent with your trading!

Now you should know how Spice trading works and how to effeciently make massive Sporebucks off of others!

I made this at 2:35 AM, so I'm like half-asleep making this. Tell me in the comments what you think of this guide.
And safe travels out there friends!