Star A has an absolute magnitude of 2.5 and star B has an apparent magnitude of 2.5, but star A is a main sequence star and star B is a red giant. Which statement below is correct?
A) Star A appears brighter than star B, but actually star B and star A are the same brightness.
B) Star B appears brighter than star A, but actually star B and star A are the same brightness.
C) Star A and star B appear to have the same brightness, but actually star B is brighter than star A.
D) Star A and star B appear to have the same brightness, but actually star A is brighter than star B.
E) It is impossible to determine how bright these stars are or appear to be relative to one another, given the information above.
E
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Fill in the blank(s) with correct word
Thermonuclear fusion occurs mainly in the
A) cores of stars. B) outer layers of stars. C) both, actually
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A) Alpha Centauri B) Deneb C) Spica D) Sirius
Why do we experience night and day on Earth?
A) Earth rotates on its axis once every 24 hours. B) The Sun orbits Earth once every 24 hours. C) The Moon circles Earth once every 24 hours. D) The Sun moves around in a circle once every 24 hours, shining like a spotlight on Earth.