Answer to Question 1
Hydrogen.
Answer to Question 2
Once the usable hydrogen fuel is all burned up, there remains a helium-rich core. Once fusion is finished in the star's core, there is insufficient pressure to prevent collapse due to gravity, and the contraction generates a huge increase in internal temperature, triggering a higher level of hydrogen fusion in the star's shell. The outer shell expands from the heat of accelerated fusion, but this expansion simultaneously cools the star's surface, yielding a large, cool star.
A direct injection diesel engine injects the fuel directly into the combustion chamber. Many ...
Many fuel-control oxygen sensors are located in the exhaust manifold near its outlet so that the ...
The Schrader valve on this General Motors 3800 V-6 is located next to the fuel-pressure regulator.
Remove the fuel injector cleaning canister’s top and regulator assembly. Note that there is an ...
A BLAST alignment between human myoglobin and human a-globin showing a 25% sequence identity
The sequence of steps during delivery is shown clearly in these drawings