How do astronomers know that the luminous regions of active nuclei of active galaxies are very small?
a. Their nuclei are much brighter than expected.
b. The orbits of stars near the center of the galactic nuclei are faster than expected.
c. The luminosity of the nuclei varies over short times.
d. The color of the nuclei is different than expected.
Question 2
Synchrotron radiation is produced
a. in planetary nebulae.
b. by red dwarfs.
c. in massive stars as their iron core collapses.
d. in supernova.
e. by neutrinos.
Total fertility rates (TFRs) among major regions of the world.
Position of the lungs within the thoracic cavity; anterior view illustrating regions of the lungs an
Relationship of the 12 cranial nerves to specific regions of the brain.
Comet Nuclei
Global Soil Regions
Frontal section through the right side of the skull showing the three principal regions of the ear