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.
The visual field as seen by a person with (a) glaucoma, (b) macular degeneration, and (c) cataracts.
Vision with macular degeneration is experienced with an inability to focus in the center of the visu
Apparent Magnitude Scale
The Location of Visual Area V5
Understanding Food Claims Not all label claims are created equal!
Mottled Sea Star (Evasterias troschelii) eating a clam, Alaska.