The Technology Tree
The technology tree begins with the Dyson Sphere icon. When a technology has been researched, its icon in the real tech tree in the game turns green. An orange arrow leads to Electromagnetism to its right as it's displayed in the game. This icon is still gray because it hasn't been researched. Electromagnetism is the first real technology in the game. All other technologies require it. Click on the Electromagnetism icon to open its page.
