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Technology on Instagram: "A high-speed color camera filming at 16,000 frames per second captured this stunning plasma shot inside the ST40 fusion reactor. The edge glows pink as lithium is introduced into the system, turning red when excited and green once ionized, tracing the plasma’s magnetic field lines. The plasma core is far too hot to emit visible light, reaching temperatures hotter than the center of the sun. This experiment is part of a $52 million upgrade focused on lithium injection an