National Geographic Channel

Known Universe

|   webisodedescription|   hidedescription

Scientists working to defend us from a cataclysmic crash, before we explore deep space collisions on a colossal scale.

What Do Aliens Look Like?

|   videodescription|   hidevideodescription

Exploring our own planet for clues as to what extraterrestrial life might look like, what if we do make contact?

duration: (03:01)Genre: Science

morevideosfrom Known Universe

10

relatedvideos