31.0 MB (550.4 KB compressed)
4694 x 2305 pixels
39.6 x 19.6 cm ⏐ 15.6 x 7.7 in (300dpi)
MONICA SCHROEDER / SCIENCE PHOTO LIBRARY MONICA SCHROEDER / SCIENCE PHOTO LIBRARY
Illustration of a proton and a neutron, subatomic particles composed of quarks. A proton consists of two up quarks and one down quark and a neutron has two down quarks and one up quark.
Model release not required. Property release not required.