NASA announced on July 7, 2026, that its New Horizons spacecraft has successfully resumed active operations after completing its longest hibernation period to date, lasting 321 days in the deep space environment of the Kuiper Belt.
The spacecraft emerged from the routine power-saving cycle in good health approximately 9.5 billion kilometers from Earth, moving at a speed of 480 million kilometers per year.
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Because of the extreme distance, confirmation radio signals required 8 hours and 52 minutes to travel through NASA's Deep Space Network from the Madrid station to the mission operations center in Maryland.
Flight controllers at the Johns Hopkins Applied Physics Laboratory confirmed the vessel executed stored commands uplinked in July 2025 to end the hibernation phase that began on August 7, 2025.
While primary systems powered down to conserve resources, specific instruments remained operational to continuously gather scientific observations without interruption.
"Every status report through this hibernation period was 'green,' meaning all was well aboard New Horizons each and every week," said Alice Bowman, the New Horizons mission operations manager at the Johns Hopkins Applied Physics Laboratory.
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Engineers are currently downlinking spacecraft health data before retrieving the accumulated data.
In approximately three weeks, the onboard Alice ultraviolet spectrograph will join active instruments to study the distribution of hydrogen gas in the outer heliosphere, while teams conclude ground software updates scheduled for evaluation through the remainder of the year.
"The data from the termination shock encounter will be a treasure trove for space physicists worldwide who are eager to understand how this vast boundary works," said Pontus Brandt, New Horizons project scientist at APL.
The current phase utilizes updated onboard autonomy logic tailored to handle reduced power from its radioisotope thermoelectric generator and prolonged communication delays.
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The spacecraft previously completed a flyby of Pluto in July 2015 and recorded observations of the planetesimal Arrokoth on January 1, 2019, before reaching a distance 60 times farther from the Sun than Earth on October 1, 2024.
