•Question 4  (1 point) The black hole in the center of our Milky Way galaxy seems to be about 2.6 million times the mass of the sun according to the text.  (Recently updated to 3.6 million solar masses, so use the new value here.)  What is the radius of its event horizon? Think about how big this is compared to other astronomical objects (e.g., Earth, the sun, the solar system, the distances between stars). •Use the equation for the even horizon radius, R = 2GM/C2 and plug in the right numbers.  Or remember that the horizon for a solar mass black hole is 3 km, and multiply by 3.6 million.