Comets, often described as "dirty snowballs" or "icy mudballs," are primitive remnants from the formation of our solar system roughly 4.6 billion years ago. While asteroid strikes are more frequent, a comet impact carries unique risks due to its immense velocity and volatile composition of frozen gases, rock, and dust. The Mechanics of an Impact
A comet’s potential for destruction is defined by its mass and speed. Comet Impact
: While asteroids typically hit at about 20 km/s, comets can reach speeds up to 71 km/s. Because kinetic energy scales with the square of velocity, a comet can deliver more than 100 times the energy of a similarly sized asteroid. Comets, often described as "dirty snowballs" or "icy
What Is a Comet? | NASA Space Place – NASA Science for Kids : While asteroids typically hit at about 20
: Long-period comets can be pulled apart by the sun's gravity before reaching Earth, potentially hitting as a "cluster" of fragments rather than a single body.
Scientists have identified several points in history where comet impacts may have reshaped Earth's climate and human society:
: Upon impact, comets can create massive vapor plumes that rise thousands of kilometers into the atmosphere, depositing debris that increases opacity and drastically lowers global temperatures. Historical and Theoretical Impacts