Voyager probe 'leaves Solar System' - 40,000 years to reach nearest star!

12 September 2013 Last updated at 19:00

Voyager probe 'leaves Solar System'By Jonathan Amos Science correspondent, BBC News

Voyager artist impression Voyager will live out its days circling the centre of our Milky Way Galaxy

The Voyager-1 spacecraft has become the first manmade object to leave the Solar System.Scientists say the probe's instruments indicate it has moved beyond the bubble of hot gas from our Sun and is now moving in the space between the stars.Launched in 1977, Voyager was sent initially to study the outer planets, but then just kept on going. Today, the veteran Nasa mission is almost 19 billion km (12 billion miles) from home. This distance is so vast that it takes 17 hours now for a radio signal sent from Voyager to reach receivers here on Earth.

"This is really a key milestone that we'd been hoping we would reach when we started this project over 40 years ago - that we would get a spacecraft into interstellar space," said Prof Ed Stone, the chief scientist on the venture.

"Scientifically it's a major milestone, but also historically - this is one of those journeys of exploration like circumnavigating the globe for the first time or having a footprint on the Moon for the first time. This is the first time we've begun to explore the space between the stars," he told BBC News. Sensors on Voyager had been indicating for some time that its local environment had changed. The data that finally convinced the mission team to call the jump to interstellar space came from the probe's Plasma Wave Science (PWS) instrument. This can measure the density of charged particles in Voyager's vicinity.

Readings taken in April/May this year and October/November last year revealed a near- 100-fold jump in the number of protons occupying every cubic metre of space.

Mission chief scientist Professor Ed Stone: "We got there!"

Scientists have long theorised such a spike would eventually be observed if Voyager could get beyond the influence of the magnetic fields and particle wind that billow from the surface of the Sun.

When the Voyager team put the new data together with information from the other instruments onboard, they calculated the moment of escape to have occurred on or about 25 August, 2012. This conclusion is contained in a report published by the journal Science.

"This is big; it's really impressive - the first human-made object to make it out into interstellar space," said Prof Don Gurnett from the University of Iowa and the principal investigator on the PWS. On 25 August, 2012, Voyager-1 was some 121 Astronomical Units away. That is, 121 times the separation between the Earth and the Sun. Breaching the boundary, known technically as the heliopause, was, said the English Astronomer Royal, Prof Sir Martin Rees, a remarkable achievement: "It's utterly astonishing that this fragile artefact, based on 1970s technology, can signal its presence from this immense distance."

Although now embedded in the gas, dust and magnetic fields from other stars, Voyager still feels a gravitational tug from the Sun, just as some comets do that lie even further out in space. But to all intents and purposes, it has left what most people would define as the Solar System. It is now in a completely new domain.

Voyager-1 departed Earth on 5 September 1977, a few days after its sister spacecraft, Voyager-2.

The pair's primary objective was to survey the planets Jupiter, Saturn, Uranus and Neptune - a task they completed in 1989.

They were then steered towards deep space. It is expected that their plutonium power sources will stop supplying electricity in about 10 years, at which point their instruments and their 20W transmitters will die.

Voyager-1 will not approach another star for nearly 40,000 years, even though it is moving at 45km/s (100,000mph).

"Voyager-1 will be in orbit around the centre of our galaxy with all its stars for billions of years," said Prof Stone.

Pale Blue Dot In 1990, Voyager-1 looked back and took a picture of Earth - a "pale blue dot" The probe's work is not quite done, however. For as long as they have working instruments, scientists will want to sample the new environment.The new region through which Voyager is now flying was generated and sculpted by big stars that exploded millions of years ago.There is indirect evidence and models to describe the conditions in this medium, but Voyager can now measure them for real and report back. The renowned British planetary scientist Prof Fred Taylor commented: "As a young post- doc, I went to [Nasa's Jet Propulsion Laboratory] and worked for a while with the team that was doing the science definition study for the Outer Planets Grand Tour, which later became Voyager.

"It seemed so incredible and exciting to think we would see and explore Jupiter and Saturn close up, let alone Uranus and Neptune.

"The idea that the spacecraft would then exit the Solar System altogether was so way out, figuratively as well as literally, that we didn't even discuss it then, although I suppose we knew it would happen someday. Forty-three years later, that day has arrived, and Voyager is still finding new frontiers."

Schematic of the Solar System The Sun sits in an extensive bubble of hot gas called the heliosphere

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Cosmic Journeys examines the great promise of the Voyager mission and where it will lead us in our grand ambition to move out beyond our home planet. The two Voyager spacecraft are part of an ancient quest to push beyond our boundaries... to see what lies beyond the horizon. Now tens of billions of kilometers from Earth, two spacecraft are streaking out into the void. What will we learn about the Galaxy, the Universe, and ourselves from Voyager's epic Journey to the stars?

December 19, 1972... the splashdown of the Apollo 17 crew capsule marked the end of the golden age of manned spaceflight. The Mercury.... Gemini... and Apollo programs had proven that we could send people into space... To orbit the Earth.... Fly out beyond our planet... Then land on the moon and walk among its ancient crater.

The collective will to send people beyond our planet faded in times of economic uncertainty, war, and shifting priorities. And yet, just five years after Apollo ended, scientists launched a new vision that was just as profound and even more far-reaching.

It didn't all go smoothly. Early computer problems threatened to doom Voyager 2. Then its radio receiver failed, forcing engineers to use a back up. Now, after more than three and a half decades of successful operations, the twin spacecraft are sending back information on their flight into interstellar space. Along the way, they have revealed a solar system rich beyond our imagining.

The journey was made possible by a rare alignment of the planets, a configuration that occurs only once every 176 years. That enabled the craft to go from planet to planet, accelerating as they entered the gravitational field of one, then flying out to the next. The Voyagers carried a battery of scientific equipment to collect data on the unknown worlds in their path. That included a pair of vidicom cameras, and a data transfer rate slower than a dialup modem.

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