Spacecalendar_todayLast updated: Apr 2026
What is Astrophysics?
/ˌæstrəˈfɪzɪks/
The branch of astronomy that applies the laws of physics to understand the nature, behaviour, and evolution of stars, galaxies, and the universe itself.
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Everyday Example
When you look at a star and wonder why it shines, you're thinking like an astrophysicist. The Sun's energy comes from nuclear fusion — hydrogen atoms fusing into helium, releasing enormous energy.
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“NASA's James Webb Space Telescope uses astrophysics principles to observe galaxies formed just 300 million years after the Big Bang — giving scientists a window 13+ billion years into the past.”
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Did you know?
Isaac Newton's Principia Mathematica (1687) showed the same laws governing a falling apple also govern planetary orbits — laying the foundation for modern astrophysics.
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Key Insight
The light from distant stars is a time machine. When you observe a star 100 light-years away, you're seeing it exactly as it was 100 years ago.
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