Mars becomes the last signpost between the Aether crew and Earth: a nearby world whose red terrain and unrealized colony plans sharpen the contrast between humanity’s ambitions and the uncertain homecoming awaiting them.

Setting and approach

On the return journey from Jupiter, the crew’s route brings them close to Mars. Tal explains that the ship will pass Mars and use its gravity, moving on and off the planet’s orbit as part of the trajectory toward Earth. The approach makes Mars more than a point in the distance: for a few days, the crew will be close enough to get a better look. Yet the planet remains a waypoint in a carefully managed route, not a destination where the crew plans to land.

Sully glimpses Mars from the cupola while the crew reviews footage ahead of a spacewalk. It is still only a pinprick among the stars, and she knows the coming walk is dangerous, despite having Ivanov’s physical clearance and the procedure memorized. Her attention returns to the ship and the plan. Mars is visible, but the immediate demands of survival and repair take precedence over the view.

A world seen differently on the way home

The crew’s earlier passage by Mars, nearly two years before, had been fleeting. Outbound, their attention was fixed on Jupiter, the planet they had never seen up close. Now Mars’s importance rests largely on its proximity to Earth. Sully thinks of its cratered red ground, orange dust, and dry riverbeds as she works in the communications pod, while the prospect of seeing it nearby briefly excites her. The same planet that barely registered on the outward journey becomes a measure of how close the crew has come to home.

That change in attention gives Mars a narrative function beyond its place in the flight plan. The approach offers the crew a possible view of another world, but its deepest significance for Sully is directional: Mars marks the final stretch toward Earth. The imagined landscape and the practical trajectory meet in the idea of a last signpost, making the planet both a physical landmark and an emblem of return.

Exploration and abandoned plans

Sully’s thoughts turn from the planet’s surface to humanity’s plans for it. An American mission had already traveled to Mars and back, conducting a geological survey and looking for possible habitat sites. Before the Aether departed, a private space-travel company had been working through the logistics of a permanent colony, which had seemed only a few years from realization. In light of the communications silence and the apparent disaster on Earth, that timetable now seems to belong to a future that may never arrive.

Mars therefore holds two versions of human ambition at once: a place already studied as a potential habitat and the focus of a projected settlement. Those efforts had treated the planet as the next frontier. For Sully, returning toward an Earth whose condition remains unknown, the plans instead underscore what may have been lost. The colony is not shown being built, and the narrative does not establish Mars as a refuge for the crew; its presence is in the contrast between confident preparation and a homecoming clouded by uncertainty.

The final landmark

By the time Sully makes radio contact with Augustine, the Aether is in orbit around Earth and the crew is preparing to dock with the International Space Station if they can, in order to gather reentry modules. Recalling the journey, she names Mars among the sights they encountered, alongside Jupiter, the Jovian moons, stars, and emptiness. Her account places Mars within the immense outward voyage while the immediate action has already returned to Earth’s orbit.

Mars’s role is thus brief but layered. It is a gravitational aid, a distant point that grows close enough to invite observation, a subject of past and prospective exploration, and the last recognizable landmark before Earth. Its nearness makes the return feel almost complete, even as the abandoned promise of colonization reminds the reader that reaching home and recovering the future are not the same thing.