The Life Cycle of a Star (3) judy thomas

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University of the Cumberlands *

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101

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Astronomy

Date

Dec 6, 2023

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docx

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3

Uploaded by j.smith1430

The Life Cycle of a Star Name: Judy Thomas _____________________________ Complete each item. Type your response in a colored font. Task #1: Lights in the Sky Go to the website http://www.seasky.org/cosmic/sky7a01.html What are constellations? Alignments in the stars that make shapes, animals, and people. A star’s brightness is known as? Its magnitude How do astronomomers rate the magnitude of a star? With a scale that gives brighter stars a low number and the dim stars a higher number. Each whole number on the scale is 2.5 times dimmer than the previous number. Are the brightest stars low magnitude or high magnitude? The brightest stars magnitude is low. Stars are identified by their color; what does the color indicate? Stars are identified by their color, which indicates their temp. What color is the highest temperature star? The highest temp stars are blue in color. What color is the lowest temperature star? The lowest temp stars are red. Use the shading tool to color the Spectral class types. Color the hottest stars on the left to the coolest stars on the right. Label the spectral Spectral Class Types for Stars O B A F G K M [Grab your reader’s attention with a great quote from the document or use this space to emphasize a key point. To place this text box anywhere on the page, just drag it.] [Grab your reader’s attention with a
classes approximately under each star (G, B, F, A, O, K, M) Task #2: A Nuclear Furnace Continue to read on to the section “A Nuclear Furnace” on the same webpage http://www.seasky.org/cosmic/sky7a01.html The nuclear reactions inside a star, such as our sun, conert hydrogen into helium by means of a process known as . . . Fusion A star gets its energy from . . . The star gets its energy from the nuclear reaction inside that convert into helium by means of fusion. It is a nuclear reaction that gives a star its energy. How many protons does a standard hydrogen atom have in its nucleus? Hydrogen atoms have one proton in its nucleus Task #3: The Circle of Life Continue to read on to the section “The Circle of Life” on the same webpage http://www.seasky.org/cosmic/sky7a01.html Stars begin their lives as clouds of dust and gas called . . . Stars begin their lives as clouds of dust and gas called nebulae. Describe a protostar? Matter in gas clouds that will begin to coalesce into dense regions called a protostar. At what point does nuclear fusion begin? As a protostar continues to condense it heats up and reaches a critical mass and nuclear fusion begins. The life span of a star is dependent upon . . . The size At what point does a star become red giant? When the stars fuel begins to run out it will expand into a red giant. Massive stars will become red super giants. Why do some stars become super red giants? Massive stars will become red super giants. Explain what happens when a star exhausts its remaining fuel? The pressure of the nuclear reaction is not strong enough to equalize the force of gravity and the star will collapse. Describe a planetary A planetary nebula is created when a star blows off its outer layers after running out of fuel
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