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© Boardworks Ltd of 19 Stars
© Boardworks Ltd of 19
3 of 19© Boardworks Ltd 2011 A star is ‘powered’ by nuclear fusion reactions in its core. In the Sun, and in most stars, hydrogen atoms fuse together to form helium. This provides the energy for life on Earth. What powers a star? Each second, the Sun produces 4 × joules of energy. It would take 2,000 million nuclear power plants a whole year to produce the same amount of energy on Earth. Nuclear fusion involves light atomic nuclei joining together to form heavier ones. Each fusion reaction produces a small amount of energy, but there are billions of reactions per second.
4 of 19© Boardworks Ltd 2011 However, not all elements are made in the early stages of a star’s life. Some of the heavier elements are only made when a star explodes at the end of its life. Nuclear fusion in stars produces new atoms. How are elements made? When all the hydrogen has been used up, other elements are fused together to make the heavier elements of the periodic table. In the early stages of a star’s life, nuclear fusion mainly produces light elements such as helium.
5 of 19© Boardworks Ltd 2011 Heavy elements on Earth
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7 of 19© Boardworks Ltd 2011 The life cycle of a star main sequence star neutron star black hole Every star goes through a life cycle. A star’s life cycle is determined by its size. red super giant red giant white dwarf super nova black dwarf
8 of 19© Boardworks Ltd 2011 How do stars begin and end?
9 of 19© Boardworks Ltd 2011 Life cycle of small stars
10 of 19© Boardworks Ltd 2011 What is a supernova?
11 of 19© Boardworks Ltd 2011 After a really massive red giant collapses in a supernova explosion, it leaves an object so dense that nothing, not even light, can escape its gravitational pull. Some scientists believe that there are black holes at the centre of galaxies. If light cannot escape from a black hole, then how can a black hole be observed? How are black holes formed? The end of the life cycle of really massive stars is different to that of massive stars. This is called a black hole.
12 of 19© Boardworks Ltd 2011 How can a black hole be ‘seen’?
13 of 19© Boardworks Ltd 2011 Life cycle of large stars
14 of 19© Boardworks Ltd 2011 Terms about the life cycle of stars
15 of 19© Boardworks Ltd 2011 Stars life cycle summary
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17 of 19© Boardworks Ltd 2011 Glossary
18 of 19© Boardworks Ltd 2011 Anagrams
19 of 19© Boardworks Ltd 2011 Multiple-choice quiz
Quiz on star life cycle. Using the quiz … Click through the quiz to see the questions and answers. Remember it is MUCH better to try to think of the answer,
The Birth and Death of Stars On-line Lesson. On-line Lessons: The Birth and Death of Stars What are Stars? Stars are large balls of hot gas. They look.
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Life cycle of stars Nebulae to supernova. Stars and radiation Stars are huge nuclear reactors that give off different forms of radiation (see below) all.
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Life Cycle of a Star. Stage 1 Protostars Protostars Huge clouds of gas (hydrogen) in which stars are made. Many thousands of times bigger than our.
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© 2005 Pearson Prentice Hall This work is protected by United States copyright laws and is provided solely for the use of instructors in teaching their.
THE LIFE CYCLE OF STARS Chapter 15-2 Part 3. The Aging of Massive Stars Massive stars use their hydrogen much faster than stars like the sun do. Since.
Objectives Explore the structure of the Sun. The Sun Describe the solar activity cycle and how the Sun affects Earth. Compare the different types of spectra.
The Sun: An Important Star The Suns Affects on the Earth The Sun is the only star in our solar system. It gives the energy needed by all the Earths.
Stars! A star is a large hot ball of plasma, which generates energy in its core by nuclear fusion.
Star in a Box Exploring the lifecycle of stars. Guide to this presentation White slides are section headings, and are hidden from the presentation. Show.
THIS IS HR diagram Life Cycle of Stars Geological time General Science universe gravity.
Stars 2 Star Field as seen through the Hubble Space Telescope.
Cosmic Voyage Fill in the details from the video that correspond with the Main Ideas. Main IdeaSupporting Details.
Supernovas – or things that go “bang” in the night! The next-to-last chapter in the lives of large stars.
Origin of the Elements. Origin of the Elements - 2 The Creation of the Universe There are many theories of how the universe was created. One theory developed.
White Dwarfs and Novae – The Vampire Stars. What’s a White Dwarf Like? Same size as the earth to slightly larger. Very hot – surface temperatures of up.
Nuclear Reactions Fission and Fusion. artificial (induced) transmutation Change of one element into another through bombardment of the nucleus –Nitrogen.
Stars Dr Katy Lancaster. Overview Introduction to stars –What they are –What we can measure The Hertzsprung-Russell Diagram Star life cycles –Evolution.
Chapter 24 Stars, Galaxies & the Universe. Distance units To talk about space we need to come up with distance units a little more appropriate than just.
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