November 3, 2026: NASA’s Voyager 1 is approaching a remarkable milestone in deep-space exploration, with the spacecraft expected to reach a point where radio signals from Earth take an entire day to arrive.
The spacecraft, launched nearly five decades ago, is projected to be approximately 25.9 billion kilometres from Earth by November 18, 2026, placing it at a distance equivalent to one light-day.
Voyager 1 is already the farthest human-made object from Earth, and the approaching milestone underscores the extraordinary scale of its journey.
At a distance of one light-day, mission controllers would need approximately 24 hours to transmit a command to the spacecraft. A response sent immediately would require another 24 hours to reach Earth, creating a minimum communication cycle of about 48 hours.
The delay reflects the time required for radio signals, which travel at the speed of light, to cross the vast distance between Earth and the spacecraft.
For scientists operating Voyager 1, the increasing distance means that even routine communications involve substantial waiting periods.
The milestone represents another significant chapter in the spacecraft’s nearly 50-year journey and highlights the challenges of maintaining communication with missions operating far beyond Earth.