At your telescope, you measure the parallax of the star Regulus to be one-half of the parallax of the star Denebola. What do you immediately know about their relative distance from us?
a) That Regulus is further away than Denebola.
b) That Regulus is closer than Denebola.
c) That Regulus and Denebola are approximately the same distance from Earth.
1 answer
I think it's a, that Regulus is further away than Denebola.