WIMPs are hypothetical particles that are thought to be the primary component of dark matter. They are massive, but they interact with other particles very weakly, making them difficult to detect.

The cosmological constant is a constant energy density that permeates all of space. It is thought to be the primary component of dark energy.

Dwarf galaxies have a very low mass-to-light ratio, typically greater than 100. This means that they contain a lot of dark matter.

Ultra-faint galaxies have an even lower mass-to-light ratio than dwarf galaxies, typically greater than 1000. This means that they contain even more dark matter.

Dwarf galaxies are typically about 10 kiloparsecs in size.

Ultra-faint galaxies are typically about 100 parsecs in size.

Dwarf galaxies typically have a luminosity of about 10^7 solar luminosities.

Ultra-faint galaxies typically have a luminosity of about 10^4 solar luminosities.

Dwarf galaxies typically contain about 10^7 stars.

Ultra-faint galaxies typically contain about 10^4 stars.

Dwarf galaxies are typically separated by about 1 megaparsec.

Ultra-faint galaxies are typically separated by about 100 kiloparsecs.

Dwarf galaxies typically have a velocity of about 100 km/s.

Ultra-faint galaxies typically have a velocity of about 10 km/s.

The fate of a dwarf galaxy is to eventually merge with a larger galaxy.

The fate of an ultra-faint galaxy is to eventually be tidally disrupted by a larger galaxy.