Why Water Bubbles in Space? Why Astronaut in Water Pool then Globe Curved Water background?

Why are there water bubbles in space? Why astronauts are swimming in a pool with an international space station and camera guys filming, then the background is removed with green screen or black or blue screen and the globe earth with curved water appears? What are the white dots on the black background of space? Water bubbles from the pool that were not digitally eliminated during the CGI green screen editing computer software process? I’m just asking normal human being with intellectual capacity questions? Is it still allowed to ask questions wthout being punished online? If you like my channel: ▸ Instagram: ▸ Patreon: (currently not posting new content) ▸ PayPal: ▸ Shop: ▸ Facebook: ▸Twitter: