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
The "Emu in the sky," a constellation defined by dark clouds rather than the stars.
The tolerance of male lions towards the cubs varies. They are, however, generally more likely to sha
Internal structures of main sequence stars, convection zones with arrowed cycles and radiative zones
The coagulation cascade. Both the intrinsic pathway and extrinsic pathway lead to a common pathway ...
Both the top and bottom pattern have the same frequency. However, the amount of on-time varies.
Hypothetical Range of Perceived Brightness (in jnds) as a Function of Intensity