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Stars begin as a cloud of mostly hydrogen with about 25% helium and heavier elements in smaller quantities. In the Sun, with a 107 K core, hydrogen fuses to form helium in the proton-proton chain:

 

41H → 22H + 2e+ + 2νe (4.0 MeV + 1.0 MeV)

21H + 22H → 23He + 2γ (5.5 MeV)

23He → 4He + 21H (12.9 MeV)

 

These reactions result in the overall reaction:

 

41H → 4He + 2e+ + 2γ + 2νe (26.7 MeV)

 

In more massive stars, helium is produced in a cycle of reactions catalyzed by carbon, the carbon-nitrogen-oxygen cycle.

 

In stars with cores at 108 K and masses between 0.5 and 10 solar masses, helium can be transformed into carbon in the triple-alpha process:

 

4He + 4He + 92 keV → 8*Be

4He + 8*Be + 67 keV → 12*C

12*C → 12C + γ + 7.4 MeV

 

For an overall reaction of:

 

34He → 12C + γ + 7.2 MeV

 

(Source: Wikipedia)

 

Why does Manhattan Express suck so much?

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It simulates liftoff by projecting an image on the screen while giving motion to the pod. The riders begin to feel as though they were being launched. (OK..I don't really know how that ride works other than spinning around like a roundup/rotor/gravitron.

 

Why does my cat look like an airplane (flattened ears, looks like a stealth bomber) when she gets ticked off?

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