Stars Matariki star cluster.

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Presentation transcript:

Stars Matariki star cluster

What are stars? A star is a huge sphere of very hot, glowing gas. Stars produce their own light and energy by a process called nuclear fusion. https://www.youtube.com/watch?v=32WyKgdBQgE

How do we tell the difference between a star and a planet in the night sky? A star twinkles, produces its own light and looks very small as it is very far away. A planet glows, reflects light and looks bigger as it is closer.

What colour are stars? Stars radiate light a little like glowing coals in a campfire.  Just as a glowing red-hot coal is cooler than a white-hot coal, for example, so a red star is cooler than a white star, and a white star is cooler than a blue star.   This was a major scientific discovery… simply by measuring the color of light coming from a star, and applying a little physics, it was possible to estimate a star’s surface temperature. https://www.youtube.com/watch?v=N0qFmb1BRfc

How big are stars? https://www.youtube.com/watch?v=GoW8Tf7hTGA

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