Stellar collision

  • The coming together of two stars, which through the force of gravity merge into one larger unit
  • Astronomers predict that events of this type occur in the globular clusters of our galaxy about once every 10,000 years
  • A series of stellar collisions in a dense cluster over a short period of time can lead to an intermediate-mass black hole via “runaway stellar collisions”

Impact event

  • Major impact that shaped Earth’s history
  • Said to have been responsible for the formation of the Earth–Moon system
  • As well as the evolutionary history of life
  • Believed to have help bring water on Earth, and several mass extinctions


Expanded info:

Impact structures

  • Result of impact events on solid objects and, as the dominant landforms on many of the System’s solid objects, present the most solid evidence of prehistoric events
  • Notable impact events include the Late Heavy Bombardment, which occurred early in history of the Earth–Moon system, and the Chicxulub impact, 66 million years ago, believed to be the cause of the Cretaceous–Paleogene extinction event.