NASA的旅行者1号探测器预计将于2026年11月18日美东时间凌晨5:16:07成为首个距离地球一光日的人造物体1。这一时刻标志着该探测器在飞行49年2个月11天后，将抵达约160亿英里（约260亿公里）的深空位置1。作为参照，光速为每秒约186,000英里，因此“一光日”即光在真空中一天所行进的距离1。
为了直观理解宇宙尺度，光从月球到地球仅需1.3秒，而从太阳到地球则需要约8分20秒1。目前正以每小时约38,000英里（61,000公里）速度飞行的旅行者1号，其目标指向距离地球超过17光年的格利泽445恒星，预计在4万年后接近该恒星1。与此同时，姊妹探测器旅行者2号预计将在9年后的2035年11月达到同样的距离标记1。
NASA's Voyager 1 probe is scheduled to reach a distance of one light-day from Earth at 5:16:07 AM Eastern Time on November 18, 2026, becoming the first human-made object to achieve this milestone 1. At that moment, the spacecraft will have been in flight for 49 years, 2 months, and 11 days 1. A light-day represents a vast astronomical distance of approximately 16 billion miles (about 26 billion kilometers) 1.
To provide context on cosmic scales, light travels at roughly 186,000 miles per second 1. It takes approximately 8 minutes and 20 seconds for light to travel from the Sun to Earth, while the journey from the Moon to Earth takes just 1.3 seconds 1. Voyager 1 currently moves at a speed of about 38,000 mph (61,000 kph) as it heads toward the star Gliese 445, which lies more than 17 light-years away 1. The probe is expected to pass close to Gliese 445 in approximately 40,000 years 1. Its sister spacecraft, Voyager 2, is projected to reach the one-light-day mark nine years later, in November 2035 1.
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