NASA’s plan to send two spacecraft to Venus is under growing pressure as the agency’s fiscal year 2026 budget request signals tighter funding across its science programs. The agency originally selected a pair of Discovery-class missions to explore Earth’s closest planetary neighbor, but shrinking discretionary budgets now threaten to reduce that ambition to a single probe. The outcome will shape whether the United States maintains a serious presence in Venus science or cedes ground to international competitors planning their own missions.
Two Missions, One Shrinking Budget
NASA selected both DAVINCI+ and VERITAS as Discovery missions to Venus, framing them as complementary efforts to study what the agency called a “lost habitable” world. The dual selection, announced in 2021, was meant to revive a line of inquiry that had largely stalled since the end of the Magellan mission. DAVINCI+ was designed to plunge through Venus’s thick atmosphere and measure its composition from the upper layers down to the surface, while VERITAS would orbit the planet and map its landscape with modern radar imaging.
DAVINCI+ centers on a descent probe that would sample gases and trace elements as it falls, looking for signatures that might indicate whether Venus once had oceans or a more temperate climate. VERITAS, by contrast, would fly in a polar orbit and use synthetic aperture radar to produce global maps of topography and surface texture at resolutions far sharper than the 1990s-era, Magellan data. Together, the missions were meant to answer different but connected questions about why Venus and Earth, once thought to be similar, diverged so dramatically.
That twin-mission architecture now looks vulnerable. The FY 2026 request materials, released in stages between early May and early June 2025, outline proposed constraints on NASA’s discretionary spending. The topline numbers were followed by a budget summary, mission fact sheets, and a technical supplement that together sketch a picture of limited growth for science. Within that framework, the planetary portfolio must compete directly with Earth science programs and with large astrophysics efforts supported through universe research funding.
VERITAS Faces the Longest Wait
Of the two Venus missions, VERITAS has already absorbed the most schedule pain. According to its official mission descriptions, the spacecraft is now framed for launch no earlier than 2031, a substantial delay from the late-2020s windows discussed when it was first chosen. The mission relies on partnerships with European and other international space agencies, which can spread costs but also complicate planning when one partner faces budget headwinds.
VERITAS would carry a powerful radar instrument to peer through Venus’s permanent cloud cover and reveal the contours of its mountains, plains, and volcanic structures. Its science goals include determining whether the planet is still volcanically active, tracking possible tectonic deformation, and comparing Venus’s interior dynamics with the plate-tectonic behavior seen on Earth. Those questions dovetail with broader priorities in NASA’s solar system exploration strategy, which emphasizes understanding how rocky worlds form, evolve, and sometimes lose their habitability.
The long delay creates a practical problem beyond simple impatience. When a mission lingers in extended pre-launch development, costs tend to rise as engineering teams must be retained, hardware contracts stretched out, and component designs updated to keep pace with changing standards. In a flat or declining budget environment, a project that has slipped years beyond its initial timeline becomes an easier target for further deferrals or for cancellation, especially if its key instruments have not yet entered fabrication.
DAVINCI+ and the Case for Atmospheres
DAVINCI+ faces its own uncertainties, but its profile is different. Rather than a long-lived orbiter, it is built around a single high-risk, high-reward plunge through one of the harshest atmospheres in the solar system. The probe would transmit data for only about an hour as it descends, yet that brief window could transform scientists’ understanding of Venus’s chemical history.
By measuring noble gases, isotopic ratios, and trace compounds, DAVINCI+ would test competing hypotheses about how quickly Venus lost any early water and whether it ever experienced a stable, Earth-like climate. Those measurements would also refine models of how thick atmospheres evolve around rocky exoplanets, connecting Venus research to a much broader search for habitable worlds. Because no mission has directly sampled the Venusian atmosphere since the Soviet Vega landers in the 1980s, the data would fill a decades-long gap.
In budget negotiations, that uniqueness cuts both ways. DAVINCI+ is harder to replace with indirect observations from orbit, which strengthens its scientific case. But as a mission that culminates in a single, short-lived event, it may be a tougher sell to policymakers who prefer long-duration spacecraft that can produce images and discoveries over many years.
Why One Mission May Survive
From a political standpoint, NASA has clear incentives to preserve at least one Venus mission. The United States has not fielded a dedicated spacecraft to the planet since Magellan’s radar mapping campaign began in 1989. In the interim, European and Japanese orbiters have kept Venus in the scientific spotlight, and both the European Space Agency and India are pursuing their own missions in various stages of formulation. Allowing both DAVINCI+ and VERITAS to fail would effectively concede leadership in Venus exploration for another generation.
Yet the fiscal reality outlined in the budget documents suggests that fully funding both may be unrealistic. When agencies face across-the-board constraints, projects in early design stages are often more exposed than those already in assembly or flight. Neither DAVINCI+ nor VERITAS has crossed the threshold where cancellation costs rival completion costs, leaving them vulnerable as planners look for savings.
In a forced-choice scenario, advocates for each mission emphasize different strengths. Supporters of VERITAS argue that global surface maps and gravity data would provide a foundational data set for any future landers, balloons, or sample-return efforts. Proponents of DAVINCI+ counter that without precise atmospheric chemistry, scientists cannot reconstruct Venus’s climate history or calibrate models used to interpret exoplanets. Both sides agree that the original two-mission design was scientifically optimal; the budget is what has changed.
Budget Pressure Beyond Venus
The squeeze on Venus exploration is only one symptom of a broader challenge facing NASA’s science portfolio. The same accounts that must support DAVINCI+ and VERITAS are also funding Mars sample return concepts, the Europa Clipper mission to Jupiter’s icy moon, next-generation space telescopes, and an expanding fleet of climate-monitoring satellites. Each program has its own scientific constituency and its own champions in Congress, and each draws from a finite pool of dollars.
The FY 2026 proposal transmitted to lawmakers, accessible through NASA’s main site, serves as the starting point for that competition. Congress can and often does adjust line items, sometimes restoring projects that the executive branch proposed to cut. But program managers cannot assume a rescue; they must plan against the numbers in the request while preparing to respond if appropriators add or remove funds later in the process.
For Venus science, the danger is not only losing one mission but losing both in slow motion as schedules slip and costs creep upward. Unlike Mars exploration, which benefits from decades of public engagement and a clear narrative arc toward eventual human missions, Venus lacks a sustained political base. Europa Clipper, meanwhile, is already built and heading toward launch, making it far harder to curtail. In that context, relatively early-stage Venus projects can appear expendable when trade-offs become unavoidable.
Public Engagement and the Streaming Era
One potential counterweight to that vulnerability is public interest. NASA has increasingly turned to digital storytelling platforms to highlight lesser-known missions, including Venus concepts, through video series and documentaries. The agency’s streaming hub at NASA+ and its curated series collections give mission teams a way to showcase their science cases long before launch, in hopes of building the sort of grassroots support that has historically benefited Mars rovers and flagship telescopes.
Whether those efforts can meaningfully influence budget outcomes is uncertain. Still, they underscore a growing recognition that communication is part of the survival strategy for medium-class missions. If Venus exploration can capture imaginations with compelling stories about a once-Earth-like world gone catastrophically wrong, it may become harder for policymakers to quietly let the planet slip off the exploration agenda.
What a Single-Mission Future Means
If NASA ultimately proceeds with only one Venus mission, the scientific community will lose half of a carefully designed investigation. The original pairing of DAVINCI+ and VERITAS acknowledged that atmospheric chemistry and surface geology answer different facets of the same overarching question: how a world about the size of Earth became so utterly inhospitable. Studying just the air or just the rocks is like reading alternating chapters of a book; the narrative is intelligible, but crucial context is missing.
The practical effects would ripple through the research workforce as well. Each mission supports teams of scientists, engineers, and students across multiple institutions, and each would generate data to sustain a decade or more of analysis. Canceling one would narrow career pathways in planetary science just as a new generation of researchers is entering the field, and it would reduce opportunities for international collaboration built around shared instruments and data sets.
In the longer term, the choice will also signal how the United States intends to balance its exploration priorities among the solar system’s major destinations. A commitment to at least one robust Venus mission would affirm that understanding Earth’s nearest planetary neighbor is not optional but central to questions about climate evolution, planetary habitability, and the future of Earth itself. Allowing both DAVINCI+ and VERITAS to fade under budget pressure would send the opposite message: that even high-priority science can be deferred indefinitely when fiscal realities tighten. For a world as enigmatic (and as instructive) as Venus, the stakes of that decision extend far beyond a single budget cycle.
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*This article was researched with the help of AI, with human editors creating the final content.
