NASA's New Horizons Faces Instrument Shutdown Over $4M Funding Gap

NASA's New Horizons probe may lose two key heliophysics instruments within weeks after the agency's Heliophysics division withheld $4M in committed funding. NASA chief Isaacman has signaled a possible rescue, but scientists call the potential loss immeasurable.

Key Takeaways

NASA's New Horizons probe may lose two key heliophysics instruments within weeks after the agency's Heliophysics division withheld $4M in committed funding.
NASA chief Isaacman has signaled a possible rescue, but scientists call the potential loss immeasurable.

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NASA's New Horizons spacecraft, launched in 2006 and famous for its 2015 Pluto flyby, is now at risk of losing two of its most valuable instruments — PEPSSI and SWAP — because the agency's Heliophysics division has withheld $4 million in committed annual funding since 2025.

The instruments measure neutral atoms from interstellar space carried by the solar wind, data that cannot be obtained any other way. Chief scientist Alan Stern told Science magazine the probe is in perfect condition and could operate until 2050, potentially crossing the heliopause into interstellar space.

Astrophysicist Gary Zank called the potential shutdown an immeasurable loss, noting that losing these instruments would leave a gap in our understanding of the heliosphere that no other mission can fill.

The funding shortfall stems from a previous arrangement where Heliophysics committed $2M per year alongside $10M from Planetary Science. Since 2025, the Heliophysics share has been withheld without explanation.

NASA administrator Jared Isaacman responded on X within hours, saying the agency would review the situation. He acknowledged the massive prior investment and expressed support for high-value science at low cost, but also stressed the need to free resources for new breakthrough missions.

The scientific community remains uneasy. Fran Bagenal of the New Horizons team called arbitrary shutdowns shortsighted, while Stern urged that the hardly believable consideration of cancellation be reversed.