If you measure a parallax of 0.006 arc seconds from an ...

[jessicacav]

If you measure a parallax of 0.006 arc seconds from an observatory on the ground, your uncertainty will be about _____.
 
  A) 10 percent
  B) 75 percent
  C) 30 percent
  D) 57 percent

Question 2

Which of the following statements is true of an eclipsing binary system?
 
  A) When one star moves in front of the other, it blocks some of the light.
  B) When one star moves in front of the other, the total brightness of the point of light increases.
  C) A light curve of an eclipsing binary system is a graph of temperature versus mass.
  D) When one star is in front of the other, the system looks like a dual point of light.

[Kedrick2014]

Answer to Question 1

C

Answer to Question 2

A

[jessicacav]

TYSM

[AmberC1996]

Thanks for the timely response, appreciate it