To understand the matter & antimatter annihilations, the following definitions are used: 

Matter	AntiMatter
solar wind Mass: 10 -21- 10 -27 grams Diameter: 10 -7 - 10 -9  cm	comet ions Mass: 10 -21- 10 -27 grams Diameter: 10 -7 - 10 -9  cm
interstellar dust  1/  Mass: 10 -3  - 10 -21 grams Diameter: 10 -1 - 10 -7 cm	comet dust Mass: 10 -3  - 10 -21 grams Diameter: 10 -1 - 10 -7 cm
small asteroids Mass: 10 -3  - 10 9 grams Diameter: 10 -1 - 10 3 cm	fragments Mass: 10 -3  - 10 9 grams Diameter: 10 -1 - 10 3 cm
asteroids Mass: 10 9  - 10 21 grams Diameter: 10 3  - 10 7 cm	comets Mass: 10 9  - 10 21 grams Diameter: 10 3  - 10 7 cm

Note: The cube root of the mass is the diameter; and the cube of the diameter is the mass. 1/ The interstellar dust composition & density has been measured.

Asteroids are composed of matter elements; & comets are composed of antimatter element.

Matter                 Opportunities * Space: The Final Frontier  * Dangers               AntiMatter
Spacecraft * Space Facilities * Science & Technology * Antimatter Energy * Economics
 -------------------------- Periodic Table of Matter-AntiMatter Elements -------------------------
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