Which is a plan for the future of space exploration?

build a space station
astronauts visiting Mars
astronauts orbiting Earth
build a space observatory

You are given an electron micrograph of a bacterial cell. in the micrograph you can clearly see three thin layers of different densities surrounding the cell. based on the micrograph, you can infer that this cell is and would appear after application of the gram stain procedure. gram-negative / pink gram-positive / purple gram-positive / pink gram-negative / purple