Astronomers discover a bright X-ray source in the Milky Way. They see no counterpart in the optical bands, but it has another st
ar orbiting it, and they determine that the X-ray source has a mass of 10 MSun. What is the most likely origin of the X-rays? a. a black hole
b. a neutron star
c. a white dwarf
d. a gamma-ray burst
X-ray emission from the central degrees of the Milky Way Bright X-ray emission traces the coherent edge brightened shell-like feature, dubbed the northern chimney, located north of Sgr A* and characterized by a diameter of about 160 pc. On the opposite side, the southern chimney appears as a bright linear feature. Bright X-ray emission is observed at high latitude
