National Geographic's "Mars" miniseries is part documentary and part science fiction. It features interviews with people working on making travel to Mars a reality. Musician and actress Jihae, who plays a set of twins in the series, and former NASA astronaut John Grunsfeld join "CBS This Morning" to discuss the series.

Astronaut Grunsfeld and actress Jihae on Nat Geo's Mars

Go beyond the weekday broadcast with "The CBS Morning Podcast.” Listen to in-depth and insightful conversations with newsmakers, authors, executives, celebrities and CBS News reporters.&nbsp;Subscribe to <a href="https://podcasts.apple.com/us/podcast/cbs-mornings-on-the-go/id1487204915" rel="noopener noreferrer" target="_blank">"CBS Mornings ON THE GO" </a>for the all the news you need to know to start your day in less than 20 minutes.

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Go beyond the weekday broadcast with "The CBS Morning Podcast.” Listen to in-depth and insightful conversations with newsmakers, authors, executives, celebrities and CBS News reporters.  Subscribe to "CBS Mornings ON THE GO" for the all the news you need to know to start your day in less than 20 minutes.

Go beyond the weekday broadcast with "The CBS Morning Podcast.” Listen to in-depth and insightful conversations with newsmakers, authors, executives, celebrities and CBS News reporters.&nbsp;Subscribe to <a href="https://podcasts.apple.com/us/podcast/cbs-mornings-on-the-go/id1487204915" rel="noopener noreferrer">"CBS Mornings ON THE GO" </a>for the all the news you need to know to start your day in less than 20 minutes.

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Astronaut Grunsfeld and actress Jihae on Nat Geo's Mars

Astronaut Grunsfeld and actress Jihae on Nat Geo's Mars