Thousands of people are expected to participate in the 130th Boston Marathon, including notable figures and celebrities. NASA astronaut Suni Williams, an astronaut who ran the marathon while aboard the International Space Station in 2007, will be among the runners. Zdeno Chára, an iconic Boston sports player, will also be participating. Chelsea Clinton, daughter of President Bill Clinton and Hillary Clinton, will participate while pregnant. Other notable participants include Des Linden, an Olympian who represented the United States in 2012 and 2016, and a 2018 Boston Marathon Champion.