Voyager 1 Bir Işık Gününe Ulaşıyor: 3 Seviyede İngilizce Haber

Voyager 1 is a spacecraft from NASA. It left Earth in September 1977. Now it is very, very far away.

On 18 November 2026, Voyager 1 reaches a special place. It is one light-day from Earth. No human-made object has ever been this far away.

So what is a light-day? It is the distance light travels in one day. That is about 26 billion kilometres. Light travels very fast through space. Light from the Moon takes a little more than one second to reach us. Light from the Sun takes about eight minutes.

Voyager 1 is also very fast. It goes about 61,000 kilometres every hour. But light is much, much faster than Voyager. So the trip took Voyager more than 49 years.

Talking to Voyager is slow now. A message from Earth takes one full day. The answer takes one more day to come back.

In October, NASA lost contact with Voyager for two days. Then the signal came back. Voyager also carries a special golden record. It has pictures and sounds from Earth.

NASA says nothing changes for the spacecraft. The big moment is only for us.

According to NASA, Voyager 1 will become the first human-made object to reach one light-day from Earth on 18 November 2026. The spacecraft set off on 5 September 1977, so the journey will have taken just over 49 years.

A light-day is the distance that light travels in 24 hours, which is about 26 billion kilometres. To put that in perspective, light from the Moon reaches us in about 1.3 seconds, while sunlight takes around eight minutes and twenty seconds.

Although Voyager 1 travels at nearly 61,000 kilometres per hour, it is extremely slow compared with light. As a result, it has needed almost half a century to cover this distance. Along the way, it visited Jupiter and Saturn, and in August 2012 it became the first spacecraft to enter interstellar space.

The great distance makes communication difficult. Radio signals move at the speed of light, so a command from Earth now takes a whole day to arrive, and the reply takes another day. In other words, engineers have to wait 48 hours for an answer. In October, NASA lost contact with the spacecraft for about two days. When the signal came back, engineers found out that one set of thrusters had stopped and Voyager had switched to its backup thrusters on its own. They still do not know why.

However, NASA points out that nothing actually changes for Voyager when it passes this point. The milestone matters only to us on Earth. Its twin, Voyager 2, is expected to reach the same distance in 2035.

On 18 November 2026, shortly after 5 a.m. Eastern time, NASA's Voyager 1 will quietly cross an invisible line. According to the agency, it will then be one light-day from Earth, a distance no human-made object has ever reached. Launched on 5 September 1977, the probe will have spent 49 years, two months and eleven days getting there.

A light-day sounds abstract until you put it into perspective. It is the distance light covers in 24 hours, roughly 26 billion kilometres. Light from the Moon reaches us in about 1.3 seconds and sunlight in just over eight minutes; even the glow of distant Neptune arrives in a little over four hours. Voyager 1, cruising at nearly 61,000 kilometres per hour, is impressively fast by human standards, yet it is a far cry from the speed of light, which explains why the journey has taken half a century.

The probe has packed a great deal into those decades. It flew past Jupiter and Saturn before becoming, in August 2012, the first spacecraft to enter interstellar space. Its twin, Voyager 2, took a different route past Uranus and Neptune and is expected to reach the same milestone in November 2035. Both carry a golden record of images and sounds meant to represent life on Earth.

Staying in touch, however, is becoming a test of patience. Because radio waves travel at the speed of light, any command now faces a round-trip delay of 48 hours. That gap felt especially long in October, when NASA lost contact with Voyager 1 for about two days. Once the signal returned, engineers discovered that one set of thrusters had stopped working and the spacecraft had switched to its backup set without being told. What triggered the problem remains a mystery.

Power is another concern, since the supply drops by about four watts a year. In early September, engineers carried out an operation nicknamed the "Big Bang", swapping three heating-related devices for ones that consume less electricity, in the hope of keeping the remaining instruments running for longer.

As NASA notes, nothing physically changes for Voyager at the one-light-day mark. The milestone is ours, not the spacecraft's.