New Horizons Wakes 5.9 Billion Miles From Earth to Resume Kuiper Belt Science
Updated
Updated · CNN · Jul 16
New Horizons Wakes 5.9 Billion Miles From Earth to Resume Kuiper Belt Science
3 articles · Updated · CNN · Jul 16
Summary
June 23 marked New Horizons’ wake-up from a planned hibernation that began on Aug. 7, 2025, with controllers confirming the spacecraft is healthy and ready to downlink stored science data.
At 5.9 billion miles from Earth, the probe is surveying Kuiper Belt objects’ rotation, orientation and shapes to test how planet-building bodies formed in the outer solar system.
Its instruments are also tracking gas in the outer heliosphere, galactic cosmic rays and unexpectedly persistent dust beyond the Kuiper Belt’s known boundary, hinting the region may extend farther than thought.
New Horizons has used hibernation more than 20 times since 2007 to conserve resources; after landmark flybys of Pluto in 2015 and Arrokoth in 2019, its current extended mission runs through 2029 and could continue toward interstellar space.
Will the Roman telescope's distant survey of the Kuiper Belt confirm or contradict what New Horizons is finding up close?
With surprising dust, atmospheres, and 'snowmen' found, is the outer solar system far stranger than scientists ever imagined?
New Horizons at 5.9 Billion Miles: Scientific Breakthroughs, Mission Resilience, and the Fight for NASA’s Future
Overview
In June 2026, New Horizons awakened from its longest hibernation, confirming its excellent health as it traveled 5.9 billion miles from Earth. The confirmation signal reassured the mission team that the spacecraft remains fully functional. Soon, New Horizons will begin new scientific observations, focusing on hydrogen in the outer heliosphere. These measurements are expected to deepen scientists’ understanding of the termination shock, the region where the solar wind slows down before entering interstellar space. By studying this transition zone, researchers hope to learn more about the boundary where New Horizons will eventually leave the solar system.