Nearly half a century after its departure from Earth, NASA's Voyager 1 spacecraft is reaching a significant distance milestone. On Wednesday at 5:16 a.m. ET (10:16 GMT), the probe is expected to cross 26 billion kilometers, or 16 billion miles, from our planet. This distance marks the equivalent of one light-day, representing the distance light travels in 24 hours.
Launched in September 1977, the spacecraft is currently traveling at approximately 61,000 kilometers per hour through interstellar space. Because radio signals travel at the speed of light, it will now take approximately 24 hours for a command sent from Earth to reach the probe. Receiving a response would require an additional 24 hours, meaning a full communication cycle spans two days.
Alan Cummings, a senior research scientist at Caltech’s Space Radiation Laboratory and a long-time member of the Voyager program, characterized the event as both an engineering milestone and a testament to the longevity of the mission. The spacecraft continues to operate in a region beyond the Sun’s solar wind, having crossed the boundary of the heliosphere in 2012.
The probe’s journey has provided unique data regarding interstellar conditions, including the first measurements of low-energy galactic cosmic rays. During its mission, Voyager 1 also conducted significant planetary explorations, discovering five moons near Saturn and identifying a thin ring around Jupiter, alongside the moons Thebe and Metis.
Key facts
- The spacecraft will reach the 26-billion-kilometer mark on Wednesday at 5:16 a.m. ET.
- Voyager 1 travels at a speed of approximately 61,000 kilometers per hour.
- The probe was launched by NASA in September 1977.
- In 2012, Voyager 1 entered interstellar space after crossing the outer boundary of the heliosphere.
- A message from Earth now requires 24 hours to reach the probe, with a 24-hour return wait.
Why it matters
The milestone highlights the extreme communication challenges faced by ground controllers. Operating at such a distance means the spacecraft is effectively inaccessible for standard maintenance or repairs, making its continued functionality a notable achievement for space agency engineers.
Background
Voyager 1 is the most distant human-made object in space, having traveled for nearly 49 years to reach its current position beyond the region dominated by the Sun's solar wind.
Source: Economic Times
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