Asteroid vs. Meteor vs. Comet: A Difference Written In the Stars

, Staff Writer
Updated May 16, 2022
Asteroid vs Meteor vs Comet definitions
    Asteroid vs Meteor vs Comet definitions
    Stars: Anatartan / iStock / Getty Images Plus / Background: Tolchik / iStock / Getty Images Plus
    Used under Getty Images license

Our solar system, a small corner of the larger Milky Way galaxy, is full of possibly trillions of objects floating through space, orbiting around celestial bodies and sometimes even making contact with planets. Three of the most common of these objects are asteroids, meteors, and comets.

Asteroids: Little Rocks Orbiting the Sun

Asteroids are the small chunks of rock that are leftover from the solar system’s formation billions of years ago. “Small” is relative here as the smallest asteroids are about the size of the average sedan. At the high end, asteroids can be as large as dwarf planets.

Most asteroids orbit the sun in a belt between Mars and Jupiter.

Meteors: Falling Stars

Meteors are the streaks of light that appear when a meteoroid enters the Earth’s atmosphere. You might know them better as falling or shooting stars.



Meteoroids are smaller pieces of asteroids, comets and sometimes planets that have broken off and begun floating through space.


Meteorites are meteors that haven’t burned up in the atmosphere and actually hit the planet’s surface.

Comets: Balls of Ice

Comets are balls of dirty ice and dust. Similar to asteroids, comets are also leftovers from the formation of the solar system.

Most comets are found in the outer solar system, orbiting just beyond Neptune. When comets get closer to the sun, their icy bodies melt, releasing gases and dust and creating a visible tail.

Other Objects Floating Through Space

Our solar system is full of so much more than just asteroids, meteors and comets, all floating in that zero gravity.



Named after the human-horse hybrids from Greek mythology, centaurs are hybrids of asteroids and comets that orbit between Jupiter and Neptune.

Trans-Neptunian Objects

These objects exist in the far reaches of our solar system. Past Neptune is a cold, dark, lonely place called Kuiper Belt where astronomers have identified over 3,000 trans-Neptunian objects. Pluto, the dwarf planet we know and love, is a trans-Neptunian object.

Space Junk

Technically referred to as orbital debris, space junk is all of the human-made junk that we left in space, including abandoned launch debris and nonfunctional spacecraft.

Astral Projection

Space is full of floating rocks and balls of hot gas that truly feel unbelievable. As you contemplate the vastness of our solar system, learn about some of the other things contained within it: