It takes light a single day to travel 16 billion miles. The Voyager 1 probe will need a little longer, just 49 years.

Before defining what a light-year is, we should define what a light-year is not: It is not a measure of time, but rather a measure of distance. The confusion arises from the “year” that comes at the ...

Alfredo has a PhD in Astrophysics and a Master's in Quantum Fields and Fundamental Forces from Imperial College London.View full profile Alfredo has a PhD in Astrophysics and a Master's in Quantum ...

"All that remained was the particular flat shape." ...

Voyager 1 is about to cross a threshold that sounds almost mythical: within about a year, the spacecraft will be a full light ...