For researchers who worked on the Voyager program and continue to study its data, the symbolic milestone of being a full light-day from Earth celebrates a mission that continues half a century after it began. Since launching in September 1977, the twin Voyager probes have outlasted many of the engineers who built them, and their flybys of the outer solar system planets remain some of the best close-up observations scientists have of those distant worlds.
Here is what the Voyagers have revealed about the solar system and interstellar space, what happens when their power finally runs out, and whether anyone — or anything — might ever intercept the messages from Earth they carry.
A NASA simulation showing where Voyager 1 is relative to the sun and solar system planets. (Image credit: NASA/JPL)
As long as that sounds, "it's still pathetically slow in the grand scheme of things," Lee told Live Science.
Pascal Lee, Voyager 2 team member
"If anything, it reminds us of the sheer vastness of space and time, and how this spacecraft is just a little mote of dust that's barely drifted out of the solar system still," Lee said.
Meanwhile Voyager 1's twin, Voyager 2, took a different route through the solar system after both probes launched in 1977, in order to swing past Uranus and Neptune after revisiting Jupiter and Saturn. Currently in interstellar space about 13 billion miles (21 million km) from Earth, Voyager 2 will reach its own light-day mark in November 2035, according to NASA.
What does a light-day mean for talking to Voyager 1?
An illustration of the Voyager probes passing beyond the heliopause, into interstellar space. (Image credit: NASA/JPL-Caltech)NASA talks to the spacecraft using radio signals, which travel at the speed of light. At a distance of one light-day, a signal sent from Earth takes 24 hours to reach Voyager 1, and a reply takes another 24 hours to make the return journey.
As the spacecraft continues to cruise deeper into space, that wait will grow longer. Moreover, 50 years of traversing the solar system and the increasing distance from our sun takes a toll on the probe itself. Because sunlight in the outer reaches is far too faint for solar panels, Voyager 1 relies on nuclear batteries that convert heat from the natural decay of plutonium into electricity. That supply is gradually dwindling, prompting NASA to gradually shut down nonessential instruments to conserve what energy remains and extend the mission as much as possible.
A montage of planets imaged by the twin Voyager probes, showing Jupiter, Saturn, Uranus and Neptune. (Image credit: NASA/JPL)
Before the Voyagers launched, the outer solar system was largely a blur of telescopic speculation. The twin probes took advantage of a planetary alignment that comes around only once every 176 years, using the gravity of giant planets to slingshot themselves onward.
We had no idea what they looked like. And all of a sudden they became places we could map, imagine ourselves exploring, landing on…they became places.
Among the more striking finds, Voyager 1 spotted active volcanoes on Jupiter's moon Io in 1979, the first time they had been seen on any world other than Earth.
"That's what Voyager was for me — a voyage of discovery," he said.
How much time does Voyager 1 have left, and what happens when it falls silent?
Each Voyager spacecraft launched with 10 science instruments. Today, only two remain active on Voyager 1 and three on Voyager 2, measuring the magnetic fields, plasma and cosmic rays of interstellar space.
Voyager's iconic "Pale Blue Dot" image shows Earth as a "mote of dust suspended in a sunbeam," in the words of Carl Sagan. (Image credit: NASA/JPL)
In one such recent effort, nicknamed the "Big Bang," engineers shut off certain high-power subsystems while switching on lower-power alternatives, which "bought us almost two more years during which we will not need to turn any instrument off," Perry said.
Because Voyager is a science mission, its mission will be considered finished when "no science instruments are operational," Perry said. "The Science Team decided that the last remaining instrument will be the magnetometer," she added. "We will never intentionally power off this instrument."
Scientists will still be able to calculate their positions based on their last known speed and trajectories, Weibel said. "We'll know intellectually where it is unless it gets intercepted."
Could an alien civilization discover the Voyager probes?
An illustration of Voyager shown next to the Golden Record. (Image credit: NASA/JPL-Caltech)That makes it unlikely that aliens will ever find the Voyager Golden Records — twin gold-plated discs meant to portray the diversity of life on Earth. They hold sounds such as wind and animal calls, greetings in 55 languages, images of our planet and a celestial map pinpointing its location — all intended for a hypothetical civilization capable of retrieving and playing them. (The probes also carry visual instructions for spinning the records).
"The chances of us going after Voyager 1 and bringing it back for the Smithsonian — not that it's likely — are more believable than any chance of an alien civilization finding it, and then playing the record," Lee said.
Kelly Perry, Voyager team member
So why send a message at all? All three scientists interviewed for this story see the Golden Record as a cosmic time capsule, a symbolic gesture meant to unite humanity around a shared home planet. For all its imperfections, including the omission of some widely spoken languages and a few mislabeled tracks, the disc remains an enduring emblem of human presence on Earth, they said.
"Knowing that Voyager will continue its mission long past my lifetime actually gives me comfort," Perry told Live Science. "Although I won't be able to speak to the Voyager spacecraft any more, I love knowing that I'll always be able to look to the stars and know they're still on their way."
Hence then, the article about out there moving into the unknown as voyager 1 reaches one light day from earth scientists reflect on its past and its future was published today ( ) and is available on Live Science ( Middle East ) The editorial team at PressBee has edited and verified it, and it may have been modified, fully republished, or quoted. You can read and follow the updates of this news or article from its original source.
Read More Details
Finally We wish PressBee provided you with enough information of ( 'Out there, moving into the unknown': As Voyager 1 reaches one light-day from Earth, scientists reflect on its past — and its future )
Also on site :
- What channel is Spain v England Nations League match on? TV coverage, live stream and kick-off time
- Lutnick under fire: How Trump’s commerce secretary cultivated Nvidia’s CEO while chip controls slipped
- ‘Dallas’ Star Reveals the Elaborate Trick Producers Used to Keep TV’s Most Infamous Shower Scene a Secret