Mon Prof Augmenté
First Stars and Galaxies
Age 15 · Astronomy
Gravity pulled enormous clouds of hydrogen and helium together. Inside these clouds, the first stars ignited and the first galaxies began to take shape.
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In the picture
- Central dense knot of gas: the most concentrated, brightest part of the cloud
- Bright white-blue point inside the cloud: a newborn star shining through surrounding gas
- Curved arm of the star spiral: a turning arrangement of stars around the center
- Translucent outer edge of the gas cloud: the diffuse boundary where the cloud thins into space
Examples
- A drain pulling water and leaves toward its center
- A campfire growing from a few sparks into a steady blaze
Key takeaways
- Gravity can gather gas into dense, star-forming clouds.
- The first stars and galaxies grew from clouds of hydrogen and helium.
Quiz: First Stars and Galaxies (Age 15)
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What force can gather gas into dense, star-forming clouds?
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What were the first stars and galaxies made from?
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What happened inside the dense clouds of gas?
The answers, each with its explanation, are in the app. This lesson has left the free week, so its quiz is part of the subscription.
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