17.9 MB (301.7 KB compressed)
2282 x 2738 pixels
19.3 x 23.1 cm ⏐ 7.6 x 9.1 in (300dpi)
MONICA SCHROEDER / SCIENCE PHOTO LIBRARY MONICA SCHROEDER / SCIENCE PHOTO LIBRARY
Illustration of a proton, a subatomic particle with a positive electric charge composed of two up quarks and down quark.
Model release not required. Property release not required.