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.
All objects in the image are distant galaxies – not stars
A permanent epicardial pacemaker. The pulse generator can be placed in subcutaneous pockets in the s
Relationship of the 12 cranial nerves to specific regions of the brain.
Merging Galaxies
World Climate Regions and Climographs
Industrial Regions