If a star's apparent visual magnitude is equal to its absolute visual magnitude, how far is the star located from Earth?
a. 0 pc b. 1 pc
c. 10 pc d. 100 pc
Question 2
An isolated black hole in empty intergalactic space would be difficult to detect because
a. there would be no stars behind it whose light would be affected by gravitational lensing.
b. it could not emit light from inside its event horizon.
c. no companion stars would be affected by its gravitational field.
d. no matter would be falling into it to create an X-ray-emitting accretion disk.
e. All of the other choices are correct.
Body plan of an echinoderm, as represented by a sea star.
Fully Convective Star
Spectra of a Metal-Poor and a Metal-Rich Star
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The two visual fields of each eye are nasal (medial) and temporal (lateral)
Flo Hyman was a 6 foot 5 inch star on the U.S. women’s volleyball team that won a silver medal in ...