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Metallic Solids

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Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability. Many...

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Theory of Metallic Conduction

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Updated: Jul 12, 2026

Scattering And Absorption of Light in Planetary Regoliths

Scattering And Absorption of Light in Planetary Regoliths

Published on: July 1, 2019

Asteroid 1986 DA: Radar Evidence for a Metallic Composition.

S J Ostro, D B Campbell, J F Chandler

Science (New York, N.Y.)

|June 7, 1991

Summary

Near-Earth object 1986 DA is highly reflective, suggesting it

Area of Science:

Planetary Science
Asteroid Research
Astrogeology

Background:

Near-Earth objects (NEOs) are crucial for understanding solar system evolution.
Radar observations provide unique insights into asteroid composition and structure.
Asteroid 1986 DA exhibits unusual reflectivity compared to other detected asteroids.

Purpose of the Study:

To investigate the composition and origin of near-Earth object 1986 DA.
To test the hypothesis of its metallic origin from a larger differentiated body.
To explore its potential relationship with iron meteorites.

Main Methods:

Radar observations of asteroid 1986 DA.
Analysis of reflectivity data.
Comparison with known asteroid and meteorite properties.

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Last Updated: Jul 12, 2026

Scattering And Absorption of Light in Planetary Regoliths

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Published on: July 1, 2019

Simulation of the Planetary Interior Differentiation Processes in the Laboratory

Simulation of the Planetary Interior Differentiation Processes in the Laboratory

Published on: November 15, 2013

Detection and Recovery of Palladium, Gold and Cobalt Metals from the Urban Mine Using Novel Sensors/Adsorbents Designated with Nanoscale Wagon-wheel-shaped Pores

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Main Results:

Asteroid 1986 DA shows significantly higher reflectivity than other radar-detected asteroids.
Surface morphology is smooth at small scales but irregular at larger scales (10-100 meters).
The high reflectivity supports a composition of Nickel-Iron (NiFe) metal.

Conclusions:

1986 DA is likely a metallic fragment from the interior of a disrupted planetesimal.
Its properties align with a differentiated origin and subsequent catastrophic disruption.
It may be a piece of, or related to the parent body of, some iron meteorites.