Recent results from very bright supernovae in very distant galaxies seem to indicate what about the expansion of the universe?

Using this, astronomers discovered that dark energy is responsible for the universe's acceleration.

The universe will end in heat death; entropy will rule the universe until all matter has been converted to energy and all of the energy is just a few degrees about absolute zero; there will be no useable energy or matter left in the universe. The increasing rate of expansion indicates that there is not enough mass or matter in the universe (including dark matter) to bring the universe back together (the big crush).

The conclusion is that matter and energy are not eternal and there must exist something outside of the universe that is not matter and energy. The clear implication is that the universe will have an ending just as it had a beginning (see Big Bang theory). This means that the universe is an open system.

The expansion of the universe appears to be accelerating, according to recent data from extremely bright supernovae in very distant galaxies.