NASA’s Voyager 2 spacecraft is one of the most remarkable achievements in space exploration. It has been travelling through space for more than four decades, visiting all four giant planets in our solar system and exploring the outer edges of our cosmic neighbourhood. But on July 23, 2023, something went wrong. Voyager 2 lost contact with Earth due to a wrong command sent by flight controllers. In this article, we will explain how this happened, what NASA is doing to reestablish communication, and why this mission is so important for our understanding of the universe.
How did Voyager 2 lose contact with Earth?
According to NASA’s Jet Propulsion Laboratory (JPL), the problem occurred when flight controllers at JPL sent a routine command to Voyager 2 to test its science instruments. The command was supposed to be executed by the spacecraft’s onboard computer, but instead, it caused the spacecraft’s antenna to shift a mere 2%, but it was enough to cut communications with Earth. This means that Voyager 2 could not receive any more commands from Earth, nor send any data back.
The reason for this error is still unknown, but JPL suspects that it might be related to the age of the spacecraft and its computer system. Voyager 2 was launched in August 1977, and its computer has a memory of only 64 kilobytes. That’s less than a modern smartphone can store in a single photo. The computer also runs on an outdated operating system that was designed in the 1970s. As a result, the computer might have misinterpreted the command or encountered a glitch that affected its antenna.
What is NASA doing to restore communication with Voyager 2?
NASA is not giving up on Voyager 2. Although it’s considered a long shot, NASA said Monday that its huge dish antenna in Canberra, Australia, is on the lookout for any stray signals from Voyager 2, currently more than 12 billion miles (19 billion kilometres) distant. It takes more than 18 hours for a signal to reach Earth from so far away. In the coming week, the Canberra antenna—part of NASA’s Deep Space Network—also will bombard Voyager 2’s vicinity with the correct command, in hopes it hits its mark.
The Canberra antenna is the only one in the world that can communicate with Voyager 2 at its current location. It has a diameter of 230 feet (70 meters) and can transmit and receive signals at different frequencies. It is also equipped with a powerful transmitter that can send commands at a rate of 20 watts, which is equivalent to a bright light bulb. However, even with this technology, NASA faces many challenges in reaching Voyager 2.
One of the challenges is interference from other sources in space, such as stars, planets, and cosmic rays. These sources can create noise that can drown out or distort the signals from Voyager 2. Another challenge is the orientation of Voyager 2’s antenna. If the antenna is not pointing directly at Earth, or if it has drifted further away from its original position, then the chances of receiving or sending signals are reduced. Moreover, there is no guarantee that Voyager 2’s computer will respond to the correct command even if it receives it. The computer might be damaged or corrupted by the wrong command or by other factors such as radiation or cosmic dust.
Despite these difficulties, NASA is optimistic that it can reestablish communication with Voyager 2 soon. The agency has experience in dealing with similar situations in the past. For example, in 2010, NASA lost contact with Voyager 2 for several weeks due to a flipped bit in its memory. The agency was able to fix the problem by sending a software patch to the spacecraft. NASA hopes that it can repeat this success with the current situation and resume its historic mission with Voyager 2.
Why is Voyager 2’s mission so important?
Voyager 2’s mission is one of the most ambitious and successful endeavours in space exploration. The spacecraft has been exploring space since it was launched in August 1977. It has visited all four giant planets in our solar system—Jupiter, Saturn, Uranus, and Neptune—and provided valuable data about their moons and rings. It has also captured stunning images of these worlds and their features, such as Jupiter’s Great Red Spot, Saturn’s rings, Uranus’ tilted axis, and Neptune’s Great Dark Spot.
But perhaps the most remarkable achievement of Voyager 2 is that it has entered interstellar space—the region beyond our solar system where the sun’s influence ends and the influence of other stars begins. Voyager 2 is only the second human-made object to reach this frontier, after its twin spacecraft Voyager 1, which crossed it in 2012. By entering interstellar space, Voyager 2 has opened a new window into the mysteries of the cosmos and the origins of our solar system.
Voyager 2 is expected to continue sending data back to Earth until around 2025 when its nuclear-powered batteries will run out of power. Until then, the spacecraft will measure the properties of interstellar space, such as the density, temperature, and pressure of the plasma and the magnetic field. It will also search for signs of other stars or planets that might be nearby. These data will help scientists understand how our solar system interacts with the rest of the galaxy and how it was formed billions of years ago.
Conclusion
Voyager 2 is a remarkable spacecraft that has made history in space exploration. It has visited all four giant planets in our solar system and entered interstellar space, providing us with invaluable data and images. However, on July 23, 2023, it lost contact with Earth due to a wrong command sent by flight controllers. NASA is working hard to reestablish communication with Voyager 2 using a huge dish antenna in Canberra, Australia. Losing contact with this spacecraft would be a major setback for space exploration, but NASA is doing everything it can to restore communication and continue receiving valuable data from Voyager 2. We hope that Voyager 2 will soon resume its journey and keep exploring the wonders of the universe.
