| cell nucleus | 2.37 | DNA replicates in the cell nucleus. | ||
| hydrogen nucleus | 0.59 | In the sun, energy is produced when hydrogen nuclei fuse to produce helium, a heavier element. | ||
| helium nucleus | 0.46 | This yields helium nuclei and tremendous amounts of energy. | ||
| suprachiasmatic nucleus | 0.39 | This region, called the suprachiasmatic nucleus or SCN, is just above the optic nerve on both sides of the brain. | ||
| comet nucleus | 0.26 | Using spacecraft, scientists have only twice viewed close-up images of comet nuclei. |