 The WTOP Traffic Center. Tracking the top trouble spots. The biggest backups. The major incidents. The slowest traffic. WTOP Traffic. Every 10 minutes. On the 8th. And when it breaks. It's 1152. Four volunteers who spent more than a year inside NASA's first simulated Mars environment have now emerged. They spent 378 days inside a 1,700 square foot space at Johnson Space Center in Houston.