Educational astronomy infographic, dark space background with stars, title "What Powers the Sun?", three large comparison panels arranged left to right. Panel 1: Chemical Burning, red X symbol, small campfire or chemical flame icon inside the Sun, label "~10,000 years", visually short timeline. Panel 2: Gravitational Contraction, orange X symbol, shrinking Sun with inward arrows, label "~20 million years", medium-length timeline. Panel 3: Nuclear Fusion, large green check mark, glowing solar core with hydrogen fusing into helium, bright energy burst, label "~10 billion years", very long timeline extending across the graphic. At the bottom: Earth age = 4.5 billion years shown as a marker intersecting only the fusion timeline. Professional university-level physics teaching resource, clean layout, high contrast, scientifically themed, vibrant colours, clear labels, modern infographic style, easy to read, visually emphasizing that chemical burning and gravitational contraction cannot explain the Sun's age while nuclear fusion can. No clutter, no watermark, presentation-ready. Move the legend that denotes the earths age to the bottom left so it is not covered by the watermark Ver más