What causes stars to twinkle?
A) It is intrinsic to the starstheir brightness varies as they expand and contract.
B) variations in the absorption of the atmosphere
C) variable absorption by interstellar gas along the line of sight to the star
D) bending of light rays by turbulent layers in the atmosphere
E) the inability of the human eye to see faint objects
Question 2
The red hydrogen alpha line carries more energy per photon than the blue-green hydrogen beta line does.
Indicate whether the statement is true or false
Internal structures of main sequence stars, convection zones with arrowed cycles and radiative zones
Rising and Setting of Stars at Middle North Latitudes
The Types of Stars and Their Sizes
Stars and the Interstellar Medium
Mass Exchange Between Close Binary Stars
The lifetime risk for schizophrenia varies with the degree of relationship to an affected individual