4 0 obj Life cycles of stars All stars begin life in the same way. A star is also born, changes, and then dies. Most of the star is blown away. Main Sequence Stars. $.' endstream <>/XObject<>/ProcSet[/PDF/Text/ImageB/ImageC/ImageI] >>/MediaBox[ 0 0 720 540] /Contents 4 0 R/Group<>/Tabs/S/StructParents 0>> This core that is cooling is called a white dwarf. The core is hot enough for the helium to fuse to form carbon. The exact lifetime of a star depends very much on its size. Life Cycle of a Star. endobj The life cycle of a star begins as a large gas cloud. Main sequence star. Life Cycle of a Star. The life cycle of a stars The life cycle of a star. Giant Gas Cloud. Life Cycle of a Star. Nuclear reactions at the centre (or core) of stars provides enough energy to make them shine brightly for many years. <> Nuclear reactions at the centre (or core) of stars provides enough energy to make them shine brightly for many years. Life Cycle of a Star like our Sun… •Our sun is at the Main Sequence stage in its life. Step 7. 7 0 obj x�\K��D��W�iC1��n�������0{ƌ���n���r���ǗR�Q]��ɪRV�3++��_ԟ*����i����$M�6���oԯj�^�����*5�}��;i��������$�[i0�ͣ�j�g ��F嵝���Q��6KR���[�������}���}w�rr����'���/��^}��j�Q�ڤ�ڶUYR) �v��H�,+��$Z�����î7�z&e�ތn�$�p�Åz�߽}�^�[��"���oƔNW.+Y%�r��JJ"�h%e��sд��f���pE�?�5��@��AM�w���"i˱���ˏv�f!��ZRcp�t絹�d��|M�d��u����1�^����sA�Rz&hB]'e� `��WCiNS�QJhU��)��z�7�O���5����ٙxs���"27�8���I��U���%Y �]�plU�Ԫ>��� L��:������DZ�,_��������讄5���_�H���̼�Vw���N���6��N�l��^��~�pd&*ݞS�[3��*��s+c��z���,܁\u�u����_d�!^�})��[""C!�ɋ$-�I���z�1w�Q!�6p-�7��R��G\��%E�Uƭ�EQ>\8pE1%s�&��� c|mw���8+�[���R��M�`�)���ɺv(�w\�������'CJt�q%�)�nO���F�ӓ�.��**U��1��J�0��@k�3����FEV��y���%ۯ8l��(¼����R�(����J�'NQW;>��7@�5}�B\��e,C��M��C�#��G��V:���d��~�V���–Ŧ��1G&a��Au��E](���Q�a3��"bBJ��*)������79�K�h`��s�M�y R�3�$m���� 9�΀ u�ƌ 6 0 obj "����D��q�t�\7��eO�D� '��\ V6��@��S���l���LU'�*��b]n%�ݪ.���S�ӑ�l�c>��������!x�)�[5��^n8q�0z������ :�+ ��'����e٪ʬ�j���o��K���y�7URiA��GL�y=N���"���UQb�[w����vrcv��ĥ��%���]�]H�% �ˑ��gQ�$CPq� � �� �9�?ε {�|���e�sR�:`-*���Q�a|2�|!��[҆t���"c. All stars are formed from collapsing clouds of gas and dust, often called nebulae or molecular clouds. The life cycle of a star Gravity and nuclear fusion reactions drive the formation and development of stars. %��������� Birth of a star Stars are formed in clouds of gas and dust, known as nebulae. <>>> %PDF-1.3 1 0 obj x�m�MkAD���8#d�{�wv��C��� Dv%5��{Wc��S_���C��� �U�4bTW�kE GD�=(¡�굇�V��O�(2ɿP���Y+�g��W�(i�M��Aj�m]et!���we��9#.�{����\�էe1���]���d�����A�q���vw��$R~Ix��1�]��! endobj Birth comes at the beginning, as with all things, and takes place in galactic "nurseries" called nebulae. Step 8 - Green - The material shed during the star's life joins new gas clouds, and new stars are formed. Towards the end of a star's life, the temperature near the core rises and this causes the size of the star to expand. The outer layers begin to expand, cool and shine less brightly. endobj Some are 50x that of the Sun. Depending on the mass of the star, its lifetime can range from a few million years for the most massive to trillions of years for the least massive, which is considerably longer than the age of the universe. Step Four (White Dwarf) All that would be left is the carbon core. . The lifespan of a star is measured in billions of years. Depending on the mass of the star, its lifetime can range from a few million years for the most massive to trillions of years for the least massive, which is considerably longer than the age of the universe.The table shows the lifetimes of stars as a function of their masses.

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