Theoretically, there should be none yet. The time that we believe it would take for a tiny white dwarf star to completely exhaust its nuclear fuel and to cease radiating light is, we believe, longer than the current age of the universe.
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It is currently estimated that there are no black dwarfs in the universe, as they are theoretical remnants of stars that have not yet cooled to that stage due to the age of the universe being younger than the estimated cooling time for a white dwarf to become a black dwarf.
It has been concluded that no more than 5 percent of the supernovae in such galaxies could be created by the process of accretion onto white dwarfs.
There are more white dwarfs than black holes in the universe. White dwarfs are the end stage of low to medium mass stars, while black holes are formed from the remnants of massive stars. Since low to medium mass stars are more common than massive stars, there are more white dwarfs in the universe.
There are many across the visible universe but the closest huge one is believed to be in the center of our galaxy - pulling the stars, planets various stuff in a counterclockwise rotation.
So far, no living beings - animals, plants, or whatever - have been confirmed to exist in other parts of the Universe. They may very well exist; we just haven't been able to research a sufficiently large part of the Universe from nearby.
MANY years ago, it was believed that the oldest white dwarf stars were older than the derived age of the Universe. This is now known to be false.
Currently it is not known. With current technology, we are not able to detect the presence of life on other planets even if it does exist. However, we now know that planets are relatively commonplace, which many scientists believe strongly suggests that life must exist elsewhere in the universe.