Suppose Kofi and Amara are in a room with a spherical glass container in the middle. Kofi is standing to the north of the container, and Amara is directly opposite him, to the south. If there is a small toy astronaut floating in the liquid inside the container in the center, from Kofi's perspective, where will the astronaut appear to be in relation to the container's sides? And if the astronaut slowly sinks to the bottom due to gravity, what will change in what Kofi sees? Respond very briefly.
From Kofi's perspective, the toy astronaut will appear to be on the side of the container closest to him (the northern side), because the container's spherical shape will cause the light rays to bend as they pass through, creating an effect similar to a lens, making the astronaut seem closer to Kofi. As the astronaut sinks to the bottom of the container due to gravity, the position where Kofi sees the astronaut will shift downward within his line of sight. The astronaut will still appear to be on the northern side but will be seen at the bottom of the container through the liquid.