A light-day is the distance that light, or any radio signal, travels in 24 hours, which means that when Voyager 1 reaches this point, a command sent from Earth will take roughly half a day to ...

5 days ago · Voyager 1, NASA’s deep-space probe, could soon become the first spacecraft to reach a historic milestone. In November 2026, the probe will be one light-day from Earth.

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3 days ago · Voyager 1 will reach one light-day from Earth in 2026, marking a first for any spacecraft as it continues its journey through interstellar space nearly 50 years after launch.

But what exactly is a light-day and how big is it? Let's explore this fascinating unit of measurement that helps us understand the vastness of the universe. What is a Light-Day? A light-day is …

A light-day is a unit of length useful in astronomy, telecommunications, and relativistic physics. It is defined as the distance that light travels in free space in one day (or 86,400 light-seconds), …

Sep 21, 2025 · Explore the concept of light-day, its astronomical significance, etymology, and how it is utilized in scientific contexts. Understand the relationship between light-day and other units …

God called the light “day,” and the darkness he called “night.” And there was evening, and there was morning—the first day.

We can say that an object is one light-year away, and that means that the object is at a distance where it took an entire year for light from the object to travel to Earth.

The meaning of LIGHT-DAY is a unit of length in astronomy that is equal to the distance that light travels in one day in a vacuum or about 26 billion kilometers.