Answer:
<em>Stellar evolution is the process by which a star changes over the course of time. 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.[1] All stars are formed from collapsing clouds of gas and dust, often called nebulae or molecular clouds. Over the course of millions of years, these protostars settle down into a state of equilibrium, becoming what is known as a main-seque</em>
After five to ten minutes of not breathing, you are likely to develop serious and possibly irreversible brain damage.
I think it is this because compression stroke it needs to be compressed then open up when started.
Think of the formula force=mass x acceleration. even though they have the same acceleration, a train has more mass. is that helpful?