FWSo  x '     C   ?~   step1  Step 1:  Nuclear fusion.  The fuel for fusion is hydrogen, and it is fused into helium.  Gravity is constant and pulls atoms inward, and gas pressure from the outer shell and from the gases fusing in the core resist gravity (push out).   The gas pressure largely depends upon temperature, so as long as the core of the star is hot enough, the gas pressure can resist gravity. l  step2  Step 2:  The star has achieved equilibrium, the gas pressure is balanced with the force of gravity.   step3  Step 3:  Fusion stops, and core temperature drops.  Nearly all of the hydrogen has been converted to helium.  Without hydrogen fusing into helium, the core temperature of the star will drop.  Gas pressure cannot resist gravity anymore.  step4  Step 4:  The core contracts.  Gravity is winning the battle against gas pressure, so the core will contract.  As the core "shrinks," the atoms in the core become more tightly packed together (dense).   The denser the core becomes, the more the temperature increases.  step5  Step 5:  As the temperature increases, there are more atoms and thus more atomic collisions. With increasing temperature and density, the core can rise to a hot enough temperature to begin nuclear fusion again. The cycle continues until the hydrogen fuel is gone.   pick_pgt  Decide whether pressure, gravity and temperature are increasing, decreasing or staying the same, then click the 'Check Answers' button.  Do this for each step of the main sequence cycle.
  hint_1  * Remember that gas pressure is a function of how fast the molecules are moving (temperature) and how many gas atoms there are packed into a certain space (volume).  If pressure is going up, then generally temperature should as well.  They are linked together in the great cycle of Gas Laws.  Don't get it?  Take a moment to review the activity we have on gas pressure. (http://aspire.cosmic-ray.org/javalabs/java12/gaslaws/index.htm)
 
 hint_2  * Remember that the definition of equilibrium is that there is NO NET CHANGE.  This doesn't mean that the atoms cannot move around; it just means that whatever small changes there are within the system cancel each other out, meaning no net overall change.
 # hint_3  * Remember that temperature and pressure are linked together.  Decreased temperature means decreased atomic collisions, resulting in a drop in gas pressure. Of course, it takes a little time for this to occur, but its not much because pressure is linked to temperature so closely.
  hint_4p  * The core is getting denser, not hotter.  The gas pressure resists gravity, but without adequate temperature the gas pressure will continue to decrease unless fusion can occur again.  This one is tricky.  Initially the temperature decreases, and gas pressure then decreases.  As the core contracts, the temperature gets hotter, but there is a lag time between increase in temperature and increase in gas pressure.
   hint_4t  * As the core contracts, it becomes more dense.  As the atoms get closer together, they can collide.  More collisions mean an increase in temperature.  Less collisions mean a decrease in temperature.
 X hint_5  * Gas pressure is now on the rise after a lag time response behind the increase in temperature.  Remember that gas pressure FOLLOWS what occurs with temperature.  Temperatures required to maintain gas pressure depend upon what type of gas you are talking about.  Temperatures for hydrogen fusion are different than for helium fusion.
   hint_grav  * Gravity is a constant.  That means it does not change.  Ever.  Not in your lifetime, not in mine.  Sir Issac Newton would be mortified to think you would want it any other way.
  ?    Arial	   6   }J 5EOVv'i
[{<wb5gVf` e.8Sq`WLb70ƻ@ A|-2, f1 iUl T&) O[6Za  5DEJ&ޛW2X@+*T/Dt2nRٱi & y _ ^im&j DIH !4X&W,/V@ 5g\9%IG & ՛T
jlT%*#.J,2b M$c6%ߚi2f*ـJL%T	_ UBb 	's>	b mc   5bVS&:o PDJh*
M^Olk,K}],Ā)7-Q 5Cb$0	sf, wS:m<	@4̦3 fC92.+#$ ?L w.Q͊At48R܀5bRTe?Mn@U©-I%%)lX slSr݅ 5gd97qa+.@ko^b56"|l0MrZ/Z  Hdegnory	<    2 ,       ( step_txt <P ALIGN="LEFT"></P>   ꀿ Z    \eR I"i/` g 5ht P +F&{V TbxPRP TnAۅ* 
 v     
        2  cycle init message_box _visible p g t indicator pressure0 selected pressure1 pressure2 gravity0 gravity1 gravity2 temp0 temp1 temp2 right right_msg 
   That's right! wrong_msg Some of your indicators are incorrect, here are some hints:
 msg_txt hint_grav next hint_1 hint_2 hint_3 hint_4p hint_4t hint_5    N   >  O < < <  N 	N            K   
N 	N       #   N 	N        N 	N            K   N 	N       #   N 	N        N 	N            K   N 	N       #   N 	N       <    O     I $      N GO   N    I V      IL       I $    N GO      N    I V      IL       I $    N GO   }   N    I ^  	         IL   	         I $    N GO      N    I }  	         I $    N GO       I $    N GO   l    N    I Q      IL       I $    N GO       O   m=TK   : < \  2[8A:V{3: 5fNyWӖf.E1rt@ 5he zw,nrݵ:EP\_;ILP+)ڠ*|L f5.c|BΙ5f㹏5gf a9&/ BkIp	 /ވӒ6)$J^<2\{4(zKU̹a:ofSv镎&h >B 5I݃o> 'mمE..Orm 5g/}O(  6L 5@3`ezRoF|eOLUݘ{p`-q^X(5H=  5N}yCq
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U'a-}k3	r}pSI/f/@	>c" 5fv >ptAxU~9h*0	
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 ݐn#@5H֯>C-B{\UI V 5lrd'yU|zeWrϬ^G\-ԛ"¹f7@ 5h4u]Fۀ>|䵼+cʜKqמ# &    Arial 12345ACGHPSTacehikmnprstuvwy6    `  ` 	  ,;fwܧ 3f{z[   8 b    mA9Rr  333      "5#Vh,RkT9"Kj'kd[Y^٥Q	[NbT#+&efH  @    
       5  selected hint running i friends length gotoAndStop                        NH B         N R  N   O P            6  	  running     hint_start 4  hint       hint    C   	 \eR   hh;O`\ W13ڌL 
+ ¨ *
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  =?w   
 ]=      `Zs%#YsSJ\-sfیSO$n  +++ cRf W@A ' 10 ftQ 'O 	  !    h t    :ײܲg\ 	!    o0          ( txt 	            @%XO@       \f \f L                 -s t !ۅPvJB i + 
&{QՀE` bxU T  s P TnAۅ* 
 v P +F&{V TbxPR     \f \f L                 -s t !ۅPvJB i + 
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 v P +F&{V TbxPR 	    ?#    go      
 pause        ?        	 
  
     &  lhint_box @     @    @   @@   `@   @   @   @   @     @    @   @@   `@   @   @   @   @  ?       	 
 @   @    
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 pause        ?        	 
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 @   @    
       5  selected hint running i friends length gotoAndStop                        NH B         N R  N   O P            6  	  running     hint_start 4  hint       hint   ?    ]0Ӏ      Hp 'g 'r'{!# X X	t o| $n  +++ cRf W@A ' 10 ftQ 'O 	     \f \f L                 -s t !ۅPvJB i + 
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 v P +F&{V TbxPR 	<    ?@   
  running  go        
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 pause        ?        	 
  
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 pause        ?        	 
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 @   	<    ?@   
  running  go        
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       &  lhint_box @     @    @   @@   `@   @   @   @   @     @    @   @@   `@   @   @   @   @  ?       	 
 @   %   ! `&0
x 	   ,CVON) -   " `>X 
 f,anh]KwZSdoa8 &   # `. 	  ,S"W+{^ 	4  $         0|temp1        i  friends _parent temp0 temp2 Array selected hint_limit hint_time running hint_box _visible txt Increase    N  N    @   L              	 
 O 	 O     I 
 hint hint_time hint_start hint_limit hint_set hint_box _x  _y _visible      4   HL    P   	    "    GO 	    "    GO  	O    	 O       	  0|,temp0        i  friends _parent temp2 temp1 Array selected hint_limit hint_time running hint_box _visible txt Decrease    N  N    @   L              	 
 O 	 O     I 
 hint hint_time hint_start hint_limit hint_set hint_box _x  _y _visible      4   HL    P   	    "    GO 	    "    GO  	O    	 O         0|temp2        j  friends _parent temp0 temp1 Array selected hint_limit hint_time running hint_box _visible txt No Change    N  N    @   L              	 
 O 	 O     I 
 hint hint_time hint_start hint_limit hint_set hint_box _x  _y _visible      4   HL    P   	    "    GO 	    "    GO  	O    	 O         0ľsgravity1        o  friends _parent gravity0 gravity2 Array selected hint_limit hint_time running hint_box _visible txt Increase    N  N    @   L              	 
 O 	 O     I 
 hint hint_time hint_start hint_limit hint_set hint_box _x  _y _visible      4   HL    P   	    "    GO 	    "    GO  	O    	 O         0ľgravity0        o  friends _parent gravity2 gravity1 Array selected hint_limit hint_time running hint_box _visible txt Decrease    N  N    @   L              	 
 O 	 O     I 
 hint hint_time hint_start hint_limit hint_set hint_box _x  _y _visible      4   HL    P   	    "    GO 	    "    GO  	O    	 O       %  0Ě8gravity2        p  friends _parent gravity0 gravity1 Array selected hint_limit hint_time running hint_box _visible txt No Change    N  N    @   L              	 
 O 	 O     I 
 hint hint_time hint_start hint_limit hint_set hint_box _x  _y _visible      4   HL    P   	    "    GO 	    "    GO  	O    	 O       ,  0ɨpressure1        q  friends _parent pressure0 pressure2 Array selected hint_limit hint_time running hint_box _visible txt Increase    N  N    @   L              	 
 O 	 O     I 
 hint hint_time hint_start hint_limit hint_set hint_box _x  _y _visible      4   HL    P   	    "    GO 	    "    GO  	O    	 O       3  0ɨ,pressure0        q  friends _parent pressure2 pressure1 Array selected hint_limit hint_time running hint_box _visible txt Decrease    N  N    @   L              	 
 O 	 O     I 
 hint hint_time hint_start hint_limit hint_set hint_box _x  _y _visible      4   HL    P   	    "    GO 	    "    GO  	O    	 O        :   0ɨpressure2        r  friends _parent pressure0 pressure1 Array selected hint_limit hint_time running hint_box _visible txt No Change    N  N    @   L              	 
 O 	 O     I 
 hint hint_time hint_start hint_limit hint_set hint_box _x  _y _visible      4   HL    P   	    "    GO 	    "    GO  	O    	 O     A ! 6PB " >VPC # r @       $ 0indicator        (  this i movieclip gotoAndStop selected 
 reset   n   F   I Z      ND I 3          N R   N  O        % m]D:`M   % b   &  
 	       #  _parent cycle next info_box show    N N      N R 	9   ' w
0 ,       ( txt Learn more about fusion 	-   (   %   & Mw/ ' W @   .   I ( lmore_info        	       #     ) $ & 7   {8	0` 5B-gE\V 5fv"ջ{\=eEԎy	$L.m+EV)re&@=mۑy\@S 2lmᩯ8*nbj>+q#GNYo.rr 5k&x'7c5{y.13Hg 5j\2ܻLsrL=ƿ0, 5fze)ir @eYU	&7"":`4Yd[j 	92&ސL(11	:@<Ԡ0e7o^{{<Ϫ̺l 0"xo@qy}˿nL   5ejf 1)5gĎ| P)ܺɼC.u\`_ jͫy0O>3zkB@)v[ 58w}0{` $^T Q%P7|fJ e$@5e:^ďԯ9 &28 l#nMl*VZh 8*sor{ RJRB !*ţV8Ҁ,YM  5e^ 81C}/˧]p}.ǠJysR2 *oF]0ƜiL9q % $#RdE`  5Fpge.9sbZ.pjy,28EZm"yI& F`	3ʹxfɎO e Ӳ
c5 5i-^%[ܖ7r%\F`1f {i \$HUnLh^gk 왳@% "bc 	ZXrU2)EH7 ZO(Jm )9'>`@`> 5d'pn@*GAn\7 5eFup&< 5hBe@dJNXgV[  T8 oxn\8۹ <9P
f(gx\8uˉ ,)':Iεvobkr7>$%x	 5heL;ӸIfÈi	pL0	p n[&,Mpn#o,-*ͬ@L LJ 5juq3Khmf Ǜ7 R`
:ϵf=G  уhf%ltP)*@ʋ9hd"a.+ K|R5亝n 5gvk[`-K.fSn\9۸2\j$ 5i'zq5B{Rڶ5Ccq!ǾN#H"(6dO֎Zl;Emw`{    ) Arial -BEMSabcegilmnqru`   * xDp  
) %)*V!NYXP( B# d-d+PP%J-*`!D%vd+U$ N * P` `   + xDp  
) 3%)*V!NYXP( B# d-d+PP%J-*`!D%vd+U$ O + T n   , ]J*   %JO 2 2(Hyqr Mg MPvXL:V y ysUV=V  곪00V ?G   - Uz)KZ|gggꆆ  _  ,'+îjÖ	' 4Y@pA  ?Y   . Vp&wx  Y       5.04HO ]ut?05ȷL@31#L  ?L   / VpXb~  +++ +P
 ~k cZ_߅8d[  ?)   0 MY)      "uߨv#TJ[՘=L&  (   1 MY)   "uߨv#TJ[՘=L& ?A   2 Vp&        5.04HO ]ut?05ȷL@31#L  \   3  ; -   .   /   0   1   2   1   2                 gotoStage = ?;   4 MA`P  Ι * `-K& ћGDoPfB//     5 M}?_O f )8  3   6   4   5               gotoStage = 3   7   4   5               gotoStage = 3   8   4   5               gotoStage = 3   9   4   5               gotoStage = 3   :   4   5               gotoStage =    ; P2 	 f"@    < P 	 f"@@    = P0 	 f"@@    > P 	 f"@     ? P	0 	 f"@     @ P2 	  "@    A P 	  "@@    B P0 	  "@@    C P 	  "@     D P	0 	  "@  	  E  ?  k  init num _parent message_box _visible indicator reset next f sun gotoAndPlay step_txt step info_txt info  gotoStage  num    8     H   >    N O    N  O          N R     '  P    H           G   G     	N 
R   GNO   GNO ?     ,   3 <O( 6 , ِ	 7 -!t 8 )W~@ 9 *{ : .tp ; 爉 < S = {)` > (  ? Tt ; 爉 @ 0 A   B   C  D X4h @ 0@      @ H S` {)@ (  Tt @   @ ~ A   B   C  D X4h@  瀑   @ ŝK 0   @ Ş@  S` {  ^RT    {  ^T @  {)@   @ D     @ G$x@  (    @     @ +@   0   P E > cycle          next             I   F U`UU$G f  J Θ	z|tuu1g1`	рs   M   G U`UU$G f f3  .s  Θ	z|tuu1g1`	р  5   H Dtp   	YP! P 
@%	p`JP_%\  	   I   H  @   ?L   J UfhYՔ5@r ;3  /s	v|xuv1gg1g`	р     K g7  P  (  P  ]tŃA*iToj1b&ٽt$сVw[hz6ѷ%XͧV؍rv ٩=BHzPLڏ+ .~,n-ds\[=V6%5ms5Y	geY5K
Ͽ 	   L   K  @      M PB     Z d R3qH "   N P
b     6 < ptFBM
 	  O   F  @ ?   ?  _parent pressure_up go pressure_down pause temp_up temp_down    X           R          R          R          R 
   startup  G     I +J sun_center        : 	  base_size d this factor f scale_factor factor1 factor2  setSize  d f L 	        GNG#	  	      GNG#     ? ? 33?3333    J   L AePZ  #   >	 L 	-U;0     ?   grav @  QTt WZnUP @  x ^   nn[6  @  ɞ0g  Vn`{ @  ]q@ enfVe` @  z@ nkO @  ]!  Wnqv8 @  u#n  ݧp.w"` @ ?     .p  M   N X  Ϯ| @ ?   <  _parent pressure_up pause pressure_down temp_up temp_down    X           R          R          R          R 
   f2 @ ?   ?  _parent pressure_up pause pressure_down temp_up temp_down go    X           R          R          R          R 
   f3 @ ?   ?  _parent pressure_up pause pressure_down go temp_up temp_down    X           R          R          R          R 
   f4 @  (P  ݧpnw"` @  "]0  G.qr8 @  #  nkO  @  F"  enfVe` @  u".  Vn`{ @  tP  nn[6  @  Ѡ0  WZnUP @ ?      AePZ @ ?   ?  _parent pressure_up go pressure_down pause temp_up temp_down    X           R          R          R          R 
   f5  Р  WZnUP @  tP  nn[6  @  s.p  Vn`{ @  E  enfVe` @    nkO @  "]  Wnqv8 @  (0  ݧp.w"` @ ?     .p  Ϯ| @ ?   ?  _parent pressure_up go pressure_down pause temp_up temp_down    X           R          R          R          R 
   f1 @      &m O nW@sun  @   P x5Lsf    - ;ʿzߥS*'M[f<3j)_0   Q hRR` @ 	  ,
[#Fu4^p 	   R   P   Q SH@   s   w R \start_movie     R      _parent cycle init      "L    N N  	      #   z   S l#W      fff 333 !53G9imڼl      %'w:#   3 -doC#A!ܧV [   T M1uP     (K%_:)p#6<G
Y#|   (    %	(REDMh    U  
 T       	       # 	%  V w[" ,f       ( msg_txt <P ALIGN="LEFT"><FONT FACE="Arial" SIZE="15" COLOR="#66FFFF">1</FONT></P><P ALIGN="LEFT"><FONT FACE="Arial" SIZE="15" COLOR="#66FFFF">2</FONT></P><P ALIGN="LEFT"><FONT FACE="Arial" SIZE="15" COLOR="#66FFFF">3</FONT></P><P ALIGN="LEFT"><FONT FACE="Arial" SIZE="15" COLOR="#66FFFF">4</FONT></P><P ALIGN="LEFT"><FONT FACE="Arial" SIZE="15" COLOR="#66FFFF">5</FONT></P><P ALIGN="LEFT"><FONT FACE="Arial" SIZE="15" COLOR="#66FFFF">6</FONT></P><P ALIGN="LEFT"><FONT FACE="Arial" SIZE="15" COLOR="#66FFFF">7</FONT></P>  b   W X K 	-         0`AȌ9n`RUz<ᄸ 
Աj9ƪAԖ1o\h  ?   X X K -        )%˘PyG*q\c,rZ[P D   Y   W   X        scroll_down    Z  scroll_down    `   Z X K          0htC~9PQ@x\/w@ 9mO"XF"F@#tuҘ}؍  A   [ X K          )%=hgQv#_֖-Ir~KQjy @   \   Z   [        scroll_up    Z  scroll_up   	   ]   Y j~ \ j~@   	  ^     ]   @"@scroll_control     ;     skip           speed  _parent   scroll_speed N    J 
 skip speed High Med Low scroll_up _parent text_field scroll scroll_down       I              L -   L        ?    IL $   L        I    A   N  NN  N  NN NQO H  	 <   N  NN  N  NN NPO   P   @   	z   _   S   U L  V 'ͅ L    ^ UV5X    2     text_field  msg_txt   scroll_speed  High    @     z _ s message_box   9  ]   	       #  bound          this   getBounds R  msg_txt  _parent 
  pick_pgt N     0  bound xMin  xMax yMin this startDrag dragging    N    "HL      "   NHL B    N    "HL "     "   N    GH            R    #             this 
  stopDrag R  5   
  dragging              updateAfterEvent =   @   
