25.8 MB (365.2 KB compressed)
2752 x 3277 pixels
23.4 x 27.7 cm ⏐ 9.2 x 10.9 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.