Answer to Question 1
c
Answer to Question 2
The dust in the ISM makes distant stars appear fainter than they would if space were
perfectly transparent. This phenomenon is called interstellar extinction, and in the neighborhood of the Sun it amounts to about 1 magnitude per thousand parsecs (pc) at visual wavelengths.
The ISM dust also affects the colors of stars. That is the reason why extinction is more severe at shorter wavelengths, which makes stars look redder than they should be. Some hot but distant O stars, for instance, actually look red and not blue. This effect is called interstellar reddening.
Seasonal changes in biomass and growth form of benthic algae in the Eel River, California: (a) in ea
Cyanobacteria of the (a) genus Synechococcus form (b) mats that line hot springs around the world.
Prostate cancer. In this example, a large mass has grown into the urinary bladder. Prostate cancer i
The patient's signature on the informed consent form indicates that the patient understands the
The breaking down of a sound—in this case, the sound of a clarinet—into its component sine waves ...
Chinese Barber Performing a Form of Percussion on a Seated Patron in China in the 1790s.