Space is vast—so vast, we haven’t found the edge. A NASA scientist explains that the observable universe spans roughly 92 billion light-years, and it’s likely even larger. From driving 6,000 years to ...

Most of us have a rough picture of space in our heads, but that picture is usually based on films, school posters, and a few mind-blowing facts we half-remember. We hear that space is huge, but our ...