9. a) what is the doppler effect? b) how does it work? c) if 12 points
a star looks bluer to us than it should, is the star moving
away from us or toward us? explain. fyi the new general
catalogue of nebulae and clusters of stars (abbreviated
as ngc) is a catalogue of deep-sky objects compiled by
john louis emil dreyer in 1888. *
ngc 6979
ngc 6974
pickering's
triangle

Why is metal often used for cooking pan?

An incident ray through the focal point of a spherical mirror will: reflect through the center of curvature. reflect back through the focal point. reflect parallel to the principle axis. reflect the same direction as the incident ray.

Choose the most likely outcome of this scenario: jen decided to go bike riding without a helmet. while no one is around during her ride, she is thrown from her bike when her wheel goes into a pothole. she is not injured, but she is terrified to get back on her bike. what happens next? a. her physical health is affected even though she wasn't hurt. b. her mental and emotional health are affected because she is afraid to get back on her bike. c. her social health is affected because she is worried her friends saw the fall. d. her overall health is not affected at all by her fall.