Ключевые слова: america, american, annually, banner, busy, ca, california, caltech, county, crowd, crowds, editorial use only, event, exhibition, experience, exploration, explore, exploring, facility, family, federal, house, institute, jet propulsion laboratory, jpl, la, line, long, los angeles, many, nasa, open, outdoor, outdoors, pasadena, people, research, space, street, technology, ticket, tour, tourism, touristic, travel, united states, usa, visit, wait, yearly,