What is the rare thing in universe?
Almost every galaxy can be classified as a spiral, elliptical, or irregular galaxy. Only 1-in-10,000 galaxies fall into the rarest category of all: ring galaxies.
What is the rarest thing ever?
Kyawthuite, a mineral, is the rarest thing in the world.
What is the rarest matter in the world?
Astatine is the rarest naturally occurring element. The total amount of astatine in the Earth's crust (quoted mass 2.36 × 1025 grams) is estimated by some to be less than one gram at any given time.
What is the rarest space object?
Double quasars are one of the rarest celestial objects in the universe, accounting for only one out of every 1000 quasars. These twin quasars are formed by two galaxies merging together. Eventually, the supermassive black holes at the center of the twin galaxies will collide and form an even more massive black hole.