Over the course of the last 20 years, and over many missions, we have inched ever closer to the day of getting humans to Mars.
But of the many issues that lie ahead in that pursuit, one is perhaps unexpected - humans and all the things that go with them are heavy.
And that's a serious problem.
Dr. Philip Metzger, Planetary Scientist at the Florida Space Institute from the University of Central Florida joined Jonathan to discuss.
Dr. Ruth Freeman and Dr. Shane Bergin also joined Jonathan to run through this week's top science news stories.
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