Author Question: Describe how gravitational lensing works. What can it tell us about the galaxy that is doing the ... (Read 43 times)

danielfitts88 · **on:** Jul 27, 2018

Describe how gravitational lensing works. What can it tell us about the galaxy that is doing the lensing? How is lensing valuable to the study of dark matter?

What will be an ideal response?

Question 2

Which of the following is NOT a planet visible to the naked eye?

A) Saturn
B) Neptune
C) Mercury
D) Jupiter

vish98 · **Reply #1 on:** Jul 27, 2018

Answer to Question 1

Gravitational lensing occurs when a nearby object (normally a galaxy) bends the light of a distant object (often a quasar), causing two or more images of the distant object to be seen. The lensing galaxy can have its mass calculated based on the amount by which it bends light. This lets us study dark matter by comparing the lensing galaxy's luminous mass with its gravitational mass.

Answer to Question 2

B