4

Homework #7

•Q3.
The Ring Nebula has an angular diameter of 72 arcsec, and we
estimate it is 5000 light years away. What is its linear diameter?

–Linear
diameter = 5000 ly x 72/206265

–Linear
diameter = 1.7 light years

•An
aside. Exansion rate is 15 km/s,
so the age is approximately 34,000 years old.