Trump Oval Office
President Donald Trump talks to astronauts on the ISS April 24 from the Oval Office, flanked by NASA astronaut Kate Rubins (left) and assistant to the president Ivanka Trump.

In a conversation with NASA astronauts on the ISS April 24, President Donald Trump called for a human mission to Mars by the end of his second term in 2024, a timeframe most in the industry do not consider feasible.

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Jeff Foust has more than a decade of experience writing about space policy, entrepreneurial ventures and regulatory affairs. In 2001, he established spacetoday.net to aggregate and summarize the day's space-related news stories. In 2003, he started The...