Asteroid the size of a house is expected to approach Earth on Thursday, one of five expected to occur this week. This is not the first time in Major League Baseball history that a ball-strike call was decided by a machine, marking the first occurrence in the sport's history. NASA could be sending a nuclear-powered spacecraft to explore Mars in two years, while the space agency hopes to send astronauts on a lunar mission next month. Meanwhile, a poll sponsored by California Democrats shows two Republican gubernatorial candidates leading among voters for the state's June primary. Travelers report high TSA wait times and uneven experiences, but the administration has not confirmed if ICE officers would vacate airports if a partial shutdown ends.