rick fienberg

Green comets are about to fly over the Earth
Comet C / 2020 F8 (SWAN) will reach the Earth closest in mid-May before rushing towards the Sun and decaying.
No GPS, no Google Map - how do astronauts locate in the universe?
We are no stranger to GPS and Google Map, tools that tell us where we are on the surface of the Earth, at coordinates. And coordinates are shown by latitude and longitude.