Content Analysis: https://scitechdaily.com/earths-hidden-guests-strange-blobs-in-deep-mantle-are-the-remains-of-an-ancient- A new NASA and Durham University

Photo Gallery

Planetary collision simulations  - from an asteroid to a Mars-sized planet
Planetary collisions simulated by supercomputer
This is a simulation if 2 Planets were to collide
Collision of planetesimals (SPH simulation)
Mars collision with rogue planet (SPH simulation)
Simulation of Theia’s Collision With Earth
Planet Collision Comparison
New Supercomputer Simulation Sheds Light on Moon’s Origin