The answer is satellites, stars, planets, asteroids and maybe even aliens.
        
    | # | Title | Description | |||
|---|---|---|---|---|---|
| 1 | Archeology from space 05:20 | 
                                In this short talk, TED Fellow Sarah Parcak introduces the field of "space archeology" -- using satellite images to search for clues to the lost sites of past civilizations.
                             | Watch |