NGC 5291
Encyclopedia
NGC 5291 is a system of interacting galaxies in the constellation
Centaurus. It is surrounded by a collisional ring, containing young and actively star forming tidal dwarf galaxies, where dark matter
has been unexpectedly detected.
Constellation
In modern astronomy, a constellation is an internationally defined area of the celestial sphere. These areas are grouped around asterisms, patterns formed by prominent stars within apparent proximity to one another on Earth's night sky....
Centaurus. It is surrounded by a collisional ring, containing young and actively star forming tidal dwarf galaxies, where dark matter
Dark matter
In astronomy and cosmology, dark matter is matter that neither emits nor scatters light or other electromagnetic radiation, and so cannot be directly detected via optical or radio astronomy...
has been unexpectedly detected.