21.3 MB (416.2 KB compressed)
2499 x 2978 pixels
21.1 x 25.1 cm ⏐ 8.3 x 9.9 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.