The astronauts move quickly to build Martian bases.

A joint mission brings about conflict between crew members.

Margo must lead a seemingly impossible mission. Danielle wants to return to the moon. Gordo grapples with life on Earth.

Ed's reckless behavior at NASA shakes the foundation of the Baldwin family. Tracy attempts to readapt to life in space.

New Helios employees arrive on Mars as NASA undergoes major changes.

An accident on Mars strains relationships, while Miles embarks on a risky venture.

A discovery sends teams across Earth and Mars scrambling for answers.

NASA is in crisis as the Soviets land the first man on the moon in 1969, the beginning of an alternate history.

Director von Braun opposes President Nixon's directive, with dire consequences.

With a little help from Molly, Ed plans a career change—as his old Jamestown crewmates Gordo and Danielle struggle.

Miles tries to make ends meet. Margo finds herself pulled into a dangerous situation.

A launchpad accident leads to delayed missions and FBI background checks.

American astronauts and NASA leadership prepare for a new mission with unlikely partners. Ellen gets in touch with an old friend.

Ellen is challenged by her new role. Margo’s allegiances are put to the test. Karen explores new opportunities—personally and professionally.

Eight years later, a new mission begins: Capture an asteroid. Aleida and Danielle are still haunted by events from the past.

Plans are made with interplanetary ramifications. Ed begins working with an unexpected partner.

A training accident spurs a national debate about women astronauts.

Gordo returns to space. Molly faces an upsetting new reality. Aleida confronts her first major hurdle at work.

After a sudden crisis, the Martian crews pull together.

Nearly a decade later, technology and lunar exploration have taken huge strides—but a solar storm threatens the astronauts on Jamestown.

As NASA scrambles to prepare for the launch to Mars, Margo is confronted with a harsh personal reality.

Unlikely partnerships are formed at a high-stakes international conference.

A group on Mars takes drastic measures. Margo grapples with a new assignment.

Deke must recruit female astronauts after Russia lands a woman on the moon.

A dispute on the moon prompts NASA officials to consider arming astronauts. Ed’s past comes back to haunt him.