Center for Meteorite Studies

How old are meteorites?
Meteorites range in age. The oldest particles in a meteorite, calcium-aluminum-rich inclusions from carbonaceous chondrites, have been dated at 4.56 billion years old. Meteorites that originate from asteroids are all ~4.5 billion years old. Meteorites that originate from the Moon range in age from 4.5 to 2.9 billion years old. Meteorites that originate on Mars range in age from 4.5 billion years old to 200 million years old.
 
Where and when do meteorites usually hit/occur?
Meteorites can and do hit the Earth anywhere and anytime. Learn more about meteorite locations, and where meteorites are found, here!
 
How do we know whether a meteorite is a new, distinct meteorite or part of an older find?
Detailed microscopic, chemical and mineralogical analyses are required to uniquely identify and classify a meteorite.  Such analyses can distinguish between two  meteorites that fell in a single area at different times, or can link two specimens of a single meteorite event that were found in separate locations or at separate times.
 
Are there non-magnetic meteorites?
Yes, however, they are extremely rare, and are not metallic. Learn more about these unusual meteorites in the achondrites section!

 

 

 

What is a meteorite? What's the difference between a meteor, meteoroid, meteorite, asteroid, planetoid, planet, comet, etc.?
A wide variety of terms is used to describe planetary bodies in the Solar System:
Planet
A large rocky, metallic and/or gaseous body in orbit around a central star.
Asteroid
A rocky and/or metallic body or collection of bodies in orbit around the Sun that formed early in Solar System history and has changed little since that time. Can also be identified as a planetoid or minor planet.
Meteoroid
A natural, solid object, up to 1 m (39 3/8") in size, moving in interplanetary space, not limited to asteroids or objects derived from a larger celestial body.*
Meteor
A trail of light produced by a meteoroid as it passes through an atmosphere (also called a "shooting star"). Most "shooting stars" observed in the night sky actually result from dust-sized particlest, rather than large objects. However, the biggest objects that fall to Earth may result in large craters, such as Barringer Meteor Crater, on the planet's surface.
Meteorite
A meteoroid that was naturally transported from the celestial body on which it formed to a region beyond that body's gravitational field, and that later collided with the surface of a celestial body larger than itself, such as Earth.* A "fall" is a meteorite that was observed to fall and then collected. A "find" is a meteorite what was not observed to fall but that was recognized by distinct features.
Comet
An ice- and rock-bearing body that travels in a highly elliptical orbit around the Sun. Gas and dust released from the comet as it nears the Sun gives a comet its characteristic tail.
 
 

 

 

 

 

 

 

 

 

 

 

 

 


Comments are closed.

Facebook
Twitter
YouTube

Sign Up for Center Updates!

Be the first to learn about CMS events and news; sign up for email updates here!


Postdoctoral Scholar Opportunities!

The Center for Meteorite Studies at Arizona State University invites applications for 2 Postdoctoral Research Associates.  Click here for details!




Meteorite of the Month

Vigarano

February's Meteorite of the Month is Vigarano, a (CV3) carbonaceous chondrite that fell the evening of January 22, 1910, near Ferrara, Italy.  Vigarano is the type specimen for the CV …


Upcoming Events

February 2018
Sunday Monday Tuesday Wednesday Thursday Friday Saturday
January 28, 2018 January 29, 2018 January 30, 2018 January 31, 2018 February 1, 2018 February 2, 2018 February 3, 2018
February 4, 2018 February 5, 2018 February 6, 2018 February 7, 2018 February 8, 2018 February 9, 2018 February 10, 2018
February 11, 2018 February 12, 2018 February 13, 2018 February 14, 2018 February 15, 2018 February 16, 2018

Earth and Space Open House

Earth and Space Open House
February 17, 2018
February 18, 2018 February 19, 2018 February 20, 2018 February 21, 2018 February 22, 2018 February 23, 2018 February 24, 2018

ASU Tempe Open Door

ASU Tempe Open Door
February 25, 2018 February 26, 2018 February 27, 2018 February 28, 2018 March 1, 2018 March 2, 2018 March 3, 2018