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.
Position of the lungs within the thoracic cavity; anterior view illustrating regions of the lungs an
Anterior and posterior views of the body illustrating the location of various body regions.
A Cluster of Galaxies
The driver information display on a Chevrolet Impala with a 5.3 liter V-8 equipped with active fuel ...
Industrial Regions
Cranial nerves and their target regions. (Sensory nerves are shown in blue; motor nerves, in red.)