How (and Why) SpaceX Will Colonize Mars¶

Source: The SpaceX Mars Series \ Date Published: August 2015 \ Author/Org: Tim Urban, Wait But Why

TL;DR¶

Tim Urban's multi-part epic, based on 10 weeks of research and direct discussions with Elon Musk, examines the chasm between Apollo-era expectations and the four-decade stagnation that followed. Apollo was not a natural step in exploration — it was a Cold War contest that cost $20B ($205B today) and was abandoned as soon as the political goal was achieved. No human has left low Earth orbit since Apollo 17 in 1972. The current space paradigm comprises three pillars: the satellite industry ($200B, 1,265 active satellites, 17,000 tracked debris objects with Kessler Syndrome risk), robotic probes (New Horizons, Curiosity, Voyager at 131 AU), and the ISS. Parts 2+ cover Musk's detailed plan for Mars colonization, positioning this article as the essential foundational context.

The Great Disappointment¶

Urban opens with a thought experiment: ask someone in 1970 where humanity would be in space by 2015. They would predict moon bases, Mars landings, orbital colonies — the future promised by Apollo's trajectory. Instead, the reality is stark: no human has left low Earth orbit since 1972.

The Apollo program was not a sustainable exploration framework. It was a crash program driven by Cold War competition:

Cost: $20 billion in 1960s dollars (~$205 billion today)
Goal: Beat the Soviets to the moon
Result: Six successful landings, then immediate cancellation

Once the political objective was achieved, the political will evaporated. Apollo was never intended to be the beginning of something — it was the end of a race.

The Current Space Paradigm¶

Urban breaks down the space economy into three distinct domains:

Satellites¶

A $200 billion industry built around communications, Earth observation, and navigation. But the orbital environment is deteriorating:

1,265 active satellites in orbit
17,000 tracked debris objects
Kessler Syndrome risk: A cascading collision cascade that could render certain orbits unusable

The satellite industry is the only self-sustaining space economy — everything else depends on government funding.

Robotic Probes¶

Unmanned exploration has been extraordinarily successful on a tiny budget relative to crewed programs:

New Horizons: Pluto flyby
Curiosity: Mars rover
Voyager: At 131 AU from Earth, still returning data after 40+ years

The ISS¶

A political construct rather than a scientific or economic one — Orbiting at ~400 km (well within LEO), it has produced valuable microgravity research but has never been a stepping stone to deeper space.

Why Mars?¶

The gap between what we imagined and what we achieved is the central tension Urban explores. The Mars colonization case rests on a single existential argument: humanity needs a multi-planet backup. A single-planet species is vulnerable to extinction from asteroid impacts, climate catastrophe, nuclear war, or pandemic. Mars is the most viable candidate for a second home because of its day length (24.6 hours), atmosphere (thin but protective), and raw materials (water ice, CO2 for fuel).

The Musk Plan (Overview)¶

Parts 2+ of the series detail SpaceX's technical approach: reusable rockets (already demonstrated with Falcon 9 landings), orbital refueling, in-situ resource utilization (ISRU for fuel production on Mars), and a self-sustaining city. The key insight: colonization requires dramatic cost reduction per ton delivered to Mars, achievable only through full reusability.

Key Takeaways¶

Apollo was a Cold War contest, not a sustainable exploration program — it cost $205B in today's dollars and was abandoned after the political goal was achieved.
No human has left low Earth orbit since Apollo 17 (1972) — 43 years of stagnation at the time of writing.
The three pillars of current space activity (satellites, robotic probes, ISS) do not naturally lead to deep-space exploration.
The orbital debris environment (17,000 tracked objects) poses a growing Kessler Syndrome risk to satellite infrastructure.
Mars colonization rests on the existential insurance argument: humanity needs a multi-planet backup.
SpaceX's approach depends on dramatic cost reduction through full reusability, orbital refueling, and ISRU.
The series is the definitive explainer of why Mars colonization is a necessity, not a luxury.