Does the halo of the milky way galaxy include other galaxies?

An incident ray through the focal point of a spherical mirror will: reflect through the center of curvature. reflect back through the focal point. reflect parallel to the principle axis. reflect the same direction as the incident ray.

Need asap ‼️ 20 pts which gravitational force field diagram is drawn correctly? (answers in pictures below)

Scientific models are based on current knowledge, which can limit their effectiveness when new discoveries are made.