16.(5) We can estimate the average volume density of the Galaxy as 4x10-³ Msun/ly³ near our sun located at 2.7x104 ly fr
Posted: Tue Jul 05, 2022 8:52 am
16.(5) We can estimate the average volume density of the Galaxy as 4x10-³ Msun/ly³ near our sun located at 2.7x104 ly from the center of the Galaxy, where Msun = 2x10³⁰ kg and 1ly = 9x10¹5 m. We can estimate the surface density of the Galaxy by multiplying the volume density with the scale height of the Galaxy. Calculate the Toomre Q value of the Galaxy. 100,000 light-years 27,000 light-years Sun 240km/s NASA/JPL-Caltech /R. Hurt (SSC) 2,000 ly