
NASA/JPL/MSSS / Wikimedia Commons (Public domain)
Top 10 Space Missions and Launches Defining 2026
Compare by Dimension
The depth and longevity of new knowledge produced — novel firsts, data quality, and how many subsequent research programmes the mission enables
| Rank | Item | Score | Notes |
|---|---|---|---|
| #1 | JAXA Martian Moons eXploration (MMX) Sample Return | 10.0 | First Mars-system sample return will answer fundamental questions about Phobos origin and early Mars geology impossible to resolve by any other method. |
| #2 | BepiColombo Mercury Orbital Insertion | 10.0 | Dual-orbiter instruments will produce a comprehensive revision of Mercury science across geology, magnetosphere, and exosphere — the highest per-mission science density on this list. |
| #3 | ESA Hera Asteroid Impact Investigation | 9.0 | Hera's interior radar sounding and crater characterisation will calibrate planetary defence models used for any future asteroid threat scenario. |
| #4 | ESA PLATO Exoplanet Mission | 9.0 | PLATO's asteroseismology-enabled stellar characterisation will produce the highest-quality Earth-zone exoplanet candidate catalogue in history. |
| #5 | Artemis II Lunar Flyby | 8.0 | Artemis II crew physiological data and deep-space system validation produce high-value engineering science, though it is not primarily a discovery mission. |
| #6 | China Chang'e 7 Lunar South Pole Exploration | 7.0 | Chang'e 7's 21-instrument south-pole survey will produce the most detailed characterisation of lunar south-pole ice and thermal environment to date. |
| #7 | Blue Origin Blue Moon Mark 1 Lunar Lander | 6.0 | Blue Moon carries science payloads but is primarily a logistics demonstration; its scientific value is secondary to its cargo delivery objective. |
| #8 | SpaceX Starship V3 Testing Campaign (Flights 12 and 13) | 5.0 | Starship V3 testing produces engineering data of high internal value to SpaceX but limited independently publishable scientific discovery. |
| #9 | Astrobotic Griffin Lunar Lander Mission | 5.0 | Griffin carries NASA science payloads but its primary mission is cargo delivery demonstration; science value depends heavily on which instruments it carries. |
| #10 | Axiom Space and Vast Space Commercial Station Partnerships | 3.0 | Commercial station partnerships produce minimal direct scientific output in 2026 — the science value will emerge when stations are operational in 2027-2030. |
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What Makes a Mission "Defining" Rather Than Just Big
Budget and launch-week headlines are the easiest way to judge a mission, but they're not the most durable one. A mission earns lasting significance more from doing something that's never been done before — a first sample return from a specific body, a first crewed flight past a certain distance, a first landing in a specific region — than from its price tag or how much coverage it got at liftoff.
Crewed and sample-return missions also carry a different kind of risk than an orbiter or a flyby, which is part of why they draw outsized attention relative to their scientific return: there's a real chance of losing the mission entirely, and years of preparation ride on a single re-entry or landing sequence. A useful test for "defining," a year or two out, is less about launch-day excitement and more about what the mission enabled next — what later missions or discoveries it made possible.
Reading Mission Timelines With a Grain of Salt
Announced launch windows for missions at this scale routinely slip, and that's true across every agency involved, not a reflection on any one program. Interplanetary and lunar missions depend on tight orbital windows, multi-country coordination, and hardware that's often flying for the first time, so a "target month" attached to a mission like this is a plan, not a guarantee.
That's worth keeping in mind when comparing missions on this list by their stated dates: the mission that looks most imminent today may not be the one that actually launches first, and a slip of months rarely says anything about whether the underlying mission is well designed.
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