We may receive a commission on purchases made from links. Voyager 1 was launched into space in 1977 and has been on a one-way journey ever since, pushing the boundaries of how far a machine built by ...

“The cosmos is also within us, we're made of star-stuff. We are a way for the cosmos to know itself.” - Carl Sagan Compared to the Sun, how big is the Earth? What is a scale model and how does it help ...