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.
Hertzsprung-Russell diagram for a set of stars that includes the Sun
Pulsars are highly magnetized, rotating neutron stars that emit a beam of electromagnetic radiation.
Motion of Stars at the Poles
The answer to “What is the proper role of children in an economy?” varies by social class, ...
Intrinsic muscles of the foot.