👉 "Earthfast" is a term used in the context of astronomy and space exploration. It refers to the phenomenon where two planets orbit each other, but their distance from the Sun varies over time due to the Earth's tilt on its axis. For example, in 2015, NASA launched a spacecraft called Galileo which was designed to study the motion of Jupiter around the Sun. The spacecraft used an elliptical orbit that included Saturn and Pluto, which caused the spacecraft to be "Earth
