Which visible star is the brightest?
A. Procyon
B. Canopus
C. Sirius
D. Alioth
Correct Answer: C (Sirius)
Explanation:
Sirius is the brightest visible star in the sky and has an apparent magnitude of -1.46. It is located in the constellation Canis Major and is also known as the “Dog Star”. Option A, Procyon, is the seventh brightest star in the sky and has an apparent magnitude of 0.34. Option B, Canopus, is the second brightest star in the sky and has an apparent magnitude of -0.72, but it is not visible from some locations in the northern hemisphere. Option D, Alioth, is a star in the constellation Ursa Major and has an apparent magnitude of 1.76, making it much fainter than Sirius.