AHA! Cosmic Moment — How Old Is the Sky? When Humans Learned the Universe Has a Birthday

 

For thousands of years, civilizations believed the universe was eternal, without beginning or end. But modern science changed that view. Edwin Hubble’s discovery that galaxies are moving apart revealed that the universe is expanding, meaning it was smaller in the past. This led to the Big Bang theory, and today scientists estimate the universe began 13.8 billion years ago. This comic helps students see the sky not as a static backdrop, but as a cosmic timeline. Every star we see tonight is ancient light, traveling across billions of years to reach us. Physics teaches us that the universe has an age; life teaches us to treasure our own brief moment within that vast story.

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