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Learning Target

1 Why are stars different colors? 2 How can scientists learn what stars are made of? 3 How can we measure the distance between stars? 4 Why do stars seem to move across the sky? Follow along in your workbook notes. =videos to watch

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TEMPERATURE LUMINOSITYLUMINOSITY

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 Sirius?  Betelgeuse?  The Sun?  Polaris?

 -A constellation is a group of stars that appear to be next to each other in space.  -When the stars are connected, they resemble figures or things.  -For centuries, people thought the position of the moon or planets in these constellations at the time of your birth determined your fate (Astrology)  Examples of constellations include the following…

Stars that are seen all year long

Constellations 101

Will Polaris always be the North Star? Does it look like a dipper from anywhere in space?

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LLight Year – the distance light travels in 1 year IIt is equal to about 6 trillion miles! TThe next closest star, Proxima Centauri, is 4.2 light years away. SSirius is 8.6 light years away. PParsec—say what?! (3.26 light years) BBut how do we measure the distance to a star? PParallax

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1 How do stars change over time? 2 What is an H-R diagram? 3 What may a star become after a supernova? Follow along in your workbook notes. Reread each page and answer questions on those pages as you go through this powerpoint. =videos to watch

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 -Cloud of gas and dust  -Mostly hydrogen  -Shockwaves from the outside force the cloud to condense to start a star forming

 -early stars that have just begun to condense (compact together)

 Normal  -average, middle- aged star like the Sun  Massive  -middle-aged star, but very heavy

 -bright stars that are 10 to 100 times larger than the Sun  -form when much of the smaller atoms have been fused  -bright star this usually well over 100 times greater than the Sun  -go through fusion fast! (millions of years) 

 -forms when the outer gases of a giant dissipate in a halo shape  -likely to condense somewhere as a new planet  -the sudden collapse of a supergiant that lasts just a few moments  -million times brighter than normal

 -the left over glowing core of a giant star  -the fate of our Sun

  -the VERY VERY dense leftover core of a supergiant that exploded (supernova)

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Are you ready for a quiz next class?