California State University, Northridge » Astronomy » Astronomy 154 - Elementary Astronomy » Spring 2022

Question #1

The perceived change in the position of an object due to a change in the observer's point of view is called _______________.

A. luminosity

B. doppler effect

C. retrograde

D. apparent magnitude

E. parallax

Question #2

Which of the following sequences of spectral classes represents the coolest to hottest stars?

A. OMKGFBA

B. EGBDFAC

C. OBAFGKM

D. MKGFABO

E. ABFGKMO

Question #3

Which of the following concerning the sun is its luminosity class?

A. 1.0 Lsun

B. main sequence

C. G2

D. 5800K

E. +4.3

Question #4

If a star has a parallax of 0.25 arc seconds, what is the distance to that star?

A. 2.5 light years

B. 25 light years

C. 25 parsecs

D. 4 parsecs

E. 4 light years

Question #5

Alan lives on a planet that is two times closer to a star than Zorg. Alan sees the star as being __________ than Zorg does.

A. two times dimmer

B. four times brighter

C. two times brighter

E. four times dimmer

Question #6

A binary star system that is detected from the drop in luminosity as one star passes in front of the other is called ___________.

A. eclipsing

B. spectroscopic

C. visual