Scientist galileo galilei used the__1__ to observe the stars and planets. this same tool has allowed modern__2__ to see objects that are billions of light years from earth. this tool also detects things such as __3__ and x-rays, which are invisible to the human eye. options for 1 weather station , telescope , microscope options for 2 meteorologists , biologists , astronomers options for 3 temperature changes, radio waves , conductivity rates