NASA will learn everything we can from the eclipse because this is our star

Millions of Americans are taking in the North American solar eclipse the first total solar eclipse visible in the United States since 2017. Tom Costello and Priscilla Thompson and NASA Administrator Bill Nelson join Andrea Mitchell to discuss what we can learn from todays historic event. Subscribe to MSNBC: Download our new MSNBC app for the latest breaking news and daily headlines at a glance: Follow MSNBC Show Blogs MaddowBlog: ReidOut Blog: MSNBC delivers breaking news, indepth analysis of politics headlines, as well as commentary and informed perspectives. Find video clips and segments from The Rachel Maddow Show, Morning Joe, The Beat with Ari Melber, Deadline: White House, The ReidOut, All In, Last Word, 11th Hour, and Alex Wagner who brings her breadth of reporting experience to MSNBC primetime. Watch Al