7. Scientists use telescopes as a tool to gather information about objects in space and the Big Bang. Which of the following are parts of the electromagnetic
spectrum that are used by telescopes?

a. Ocean waves
b. Visible light waves
c. Sound waves
d. Seismic waves

When you see distant streetlights through smog, they look dimmer and redder than they do normally. but when you see the same streetlights through fog or falling snow, they look dimmer but not redder. use your knowledge of the interstellar medium to discuss the relative sizes of the particles in smog, fog, and snowstorms compared to the wavelength of light.