For cen­turies, human­i­ty has been utter­ly trans­fixed by the cos­mos, with gen­er­a­tions of astronomers, philoso­phers and every­day pon­der­ers striv­ing to bet­ter under­stand the grand cap­sule of our exis­tence. And yet to this day, some of the most basic, fun­da­men­tal qual­i­ties of the uni­verse remain a mys­tery. How Large is the Uni­verse? is a fas­ci­nat­ing 20-minute doc­u­men­tary by Thomas Lucas and Dave Brody explor­ing the uni­verse’s immense scale of dis­tance and time.

“Recent pre­ci­sion mea­sure­ments gath­ered by the Hub­ble space tele­scope and oth­er instru­ments have brought a con­sen­sus that the uni­verse dates back 13.7 bil­lion years. Its radius, then, is the dis­tance a beam of light would have trav­eled in that time – 13.7 bil­lion light years. That works out to about 1.3 quadrillion kilo­me­ters. In fact, it’s even big­ger – much big­ger. How it got so large, so fast, was until recent­ly a deep mys­tery.”

For more on the sub­ject, see these five fas­ci­nat­ing ways to grasp the size and scale of the uni­verse.

Maria Popo­va is the founder and edi­tor in chief of Brain Pick­ings, a curat­ed inven­to­ry of cross-dis­ci­pli­nary inter­est­ing­ness. She writes for Wired UK, GOOD Mag­a­zine and Desig­nOb­serv­er, and spends a great deal of time on Twit­ter.