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meteors & meteorites

Chart plotting the evidence presented in the commentary by Weiss and Bottke.
Posted inEditors' Highlights

Fingerprints of Jupiter Formation

by B. Ehlmann 16 June 202127 January 2022

Meteorite isotopes, meteorite paleomagnetics, and planet formation models collectively show Jupiter formation via first slow then fast collection of material by core accretion in <5 million years.

Slice of a meteorite determined to have originated on Mars on the basis of its minerology and gases trapped in the rock.
Posted inNews

Martian Meteorites Shed Light on Solar System’s Early Dynamics

by Mara Johnson-Groh 24 May 20214 October 2021

Chemical compositions of rocks from Mars indicate that the earliest orbits of Jupiter and Saturn were more circular than they are today.

An illustration showing a protoplanetary disk surrounding a young Sun-like star
Posted inNews

Half of Earth’s Nitrogen May Be Homegrown

by L. Supriya 3 March 202115 February 2022

A new analysis of iron meteorites reveals a distinct isotopic signature that suggests nitrogen was present around early Earth.

Researchers conduct magnetic measurements of a meteorite at the Smithsonian Museum Support Center.
Posted inNews

Measuring Massive Magnetic Meteorites

by Andrew J. Wight 4 November 202015 February 2022

A new tool to measure the magnetic signatures of big meteorites could not only aid NASA’s mission to Psyche; it could also help solve mysteries about how magnetic fields formed in our early solar system.

Close up of granular structure of meteorite rock
Posted inEditors' Highlights

Traces of Impacts on Warm Planetesimals Early in Solar System

by Laurent G. J. Montési and J. Filiberto 9 October 20208 March 2022

Meteorite NWA 11004 contains evidence of melting preceding an impact dated to 4546±36 Ma. Short lived radioactive decay had already heated the parent body of this meteorite before the impact.

Plot showing the monthly averaged column abundances of Nickel as a function of season and month, simulated by the WACCM-Ni model
Posted inEditors' Highlights

First Model of Meteoric Nickel in the Upper Atmosphere

by Michael P. Hickey 31 August 202021 October 2021

A layer of nickel of cosmic origin, which exists between 80 and 110 km high in Earth’s atmosphere, has been modeled for the first time, including dynamics and complex neutral and ion chemistry.

A fireball in the night sky
Posted inNews

Tiny Fireballs May One Day Reveal Unseen Asteroids

by Nola Taylor Tillman 20 February 202015 February 2022

The tiny fireball that flew over Japan in 2017 came from an asteroid that could threaten Earth in 10 million years or so. Scientists are trying to use these little meteors to hunt larger objects.

a black meteorite sitting on a white table
Posted inNews

Dust Older Than the Sun Sheds Light on Galactic History

by Kimberly M. S. Cartier 23 January 20202 February 2022

A small pile of dust grains older than the Sun brings new evidence about the rate at which stars are born in the Milky Way.

Two frosted glassy spheres with bumps and cracks on their surfaces
Posted inNews

“Glass Pearls” in Clamshells Point to Ancient Meteor Impact

by R. Crowell 24 September 20197 March 2022

Research suggests that the spherical structures, smaller than grains of sand, may be microtektites, but additional investigations are needed to verify their identity.

cone-shaped meteorite
Posted inNews

Goldilocks Meteors Carved into Cones

by Mary Caperton Morton 21 August 20198 March 2022

Their “just right” shape lends some shooting stars flight stability and symmetry.

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