How are we contributing to the death of the universe!? Because, we infact are doing it all the time, from cradel to the crave. How are we doing that? We are contrubuting to the increasing entropy of the universe. Entropy, meaning somewhat the chaos of universe, what Einstein was greatly against btw, it means that the chaos in the cosmos is increasing. By chaos, I mean that everything is going from order towards disorder. Just like the arrow of time is moving only forwards, you break a glass, it shatters, but no matter what you do you can not unbreak it. So the arrow of time is obvious to us all.
Entropy might not be so obvious to us in our everyday life... but it still is present in everythin we do. It's the heat, people! From the moment we are consieved, we give out incredible amounts of body heat, from all the forms of energy heat is different in that it can not be converted 100% to other forms of energy. As the laws of conservation of energy says, energy can not be created nor destroyed, it can only be transformed to other forms. Heat energy can never flow from hot to cold, only from cold to hot. You could imagine this by thinking about chicken wings in the oven.... When they are ready, you take them out to cool, so that they don't burn, right? So, here you can see the effect off entropy, on our scale, the chicken wings when taken out from the oven, do not heat up, they cool down! This is because, like said, heat 'flows' towards cold, not the other way in the universe, that is the LAW.
Now, Earth is only a spec in our cosmos and humans even smaller, but the same concept applies to the whole universe and thus, after the Inflation caused our 'bubble' of universe to born in the Big Bang and the 'space' cooled to the 2,7 degrees above the absolute zero, formed everything that is now. The stars and cosmic events are releasing the heat of the big bang that did not go to the cosmic microwave baground radiation, but rather to the stars and such...
The heat death of the universe happens when all the energy of the stars is relesed to the universe and everything becomes "even". The temperature and total energy of the universe is then ACTUALLY 0. So, Temperature in all the cosmos is the same, thus nothing can form (no life) or diminish, everything just "is".
This is the CMBR, the afterglow of the universe, the difference in energy...
Now, imagine this being all the same colour, green, thus the same temperature.

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