The Universe is expanding, so its size is increasing.
Some types of carbon increase in density as the universe ages. Many are unstable and may increase or decrease over time.
Increase.
It is normally believed that the Universe's total mass remains constant.
It is space that is expanding. The amount of matter doesn't necessarily increase. This means that the average density of the Universe is decreasing.It is space that is expanding. The amount of matter doesn't necessarily increase. This means that the average density of the Universe is decreasing.It is space that is expanding. The amount of matter doesn't necessarily increase. This means that the average density of the Universe is decreasing.It is space that is expanding. The amount of matter doesn't necessarily increase. This means that the average density of the Universe is decreasing.
entropy in the universe
There is always an increase in the entropy of the universe.
entropy of the universe
From an infinitesimally small point to the present size, the universe is still expanding as a result of the big bang.
Some energy is converted to light or motion or something, but all heat dissipates into the billions of objects in the universe causing an increase in entropy (disorder of the universe). This is referred to as the heat death of the universe.
The entropy of the universe is increasing
Because you apparently live in an alternate universe with very different laws of physics. In this universe, the half-life of a particular nuclide is a constant.
Not by any measurable amount.