Dark matter is believed to constitute approximately 27% of the total mass-energy of the universe, while dark energy makes up about 68%.

The observed rotation curves of galaxies, which indicate that the mass of galaxies is distributed differently than expected based on visible matter alone, provide strong evidence for the existence of dark matter.

WIMPs are hypothetical particles that are massive but interact very weakly with ordinary matter, making them difficult to detect. They are considered a promising candidate for dark matter due to their theoretical properties.

Observations of distant supernovae have shown that the expansion of the universe is accelerating, which is attributed to the presence of dark energy.

The cosmological constant is a constant energy density that is believed to be responsible for the observed acceleration of the universe's expansion. It is related to dark energy, which is thought to be the dominant component of the universe's energy density.

Based on the current understanding of dark energy, the universe is expected to continue expanding forever, with the expansion rate accelerating over time.

Studying dark matter and dark energy poses several challenges, including the lack of direct detection methods, the difficulty in distinguishing dark matter from other forms of matter, and the limited understanding of the fundamental laws of physics at very large scales.

Dark matter and dark energy have the potential to provide insights into the nature of gravity, help explain the origin and evolution of the universe, and have implications for the future of the universe.

Black holes are not considered a viable explanation for dark matter because they are too massive and would have been detected by now.

Dark matter is detected through a combination of direct detection experiments, indirect detection experiments, and observational studies of galaxies and clusters.

The main challenge in detecting dark matter directly is that dark matter particles are very weakly interacting, making them difficult to detect.

The main challenge in detecting dark matter indirectly is that the signals from dark matter interactions are very weak and the background noise from other particles is very high.

The main challenge in studying dark energy is that it is very difficult to detect and very difficult to understand theoretically.

The main goal of the Dark Energy Survey is to measure the properties of dark energy.

The main goal of the Large Synoptic Survey Telescope is to search for new types of dark matter, study the evolution of galaxies, and measure the properties of dark energy.