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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 centimetre of space.
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.
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Start Quote
It's utterly astonishing ”
Prof Sir Martin Rees
English Astronomer Royal
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.
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Nasa's Voyager probes
Voyager 2 launched on 20 August 1977; Voyager 1 lifted off on 5 September the same year
Their official missions were to study Jupiter and Saturn, but the probes were able to continue on
The Voyager 1 probe is now the furthest human-built object from Earth
Both probes carry discs with recordings designed to portray the diversity of culture on Earth
To boldly go beyond the Solar System
Voyager-1 left 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 get near another star for another 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.
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."
Voayager, the pinnacle of mans efforts to reach the stars. Seriously where the hell is my tinfoil lounge suit and my Morris space plane.
This message was edited 1 time. Last update was at 2013/09/12 19:05:39
XKCD wrote:So far Voyager 1 has 'left the Solar System' by passing through the termination shock three times, the heliopause twice, and once each through the heliosheath, heliosphere, heliodrome, auroral discontinuity, Heaviside layer, trans-Neptunian panic zone, magnetogap, US Census Bureau Solar System statistical boundary, Kuiper gauntlet, Oort void, and crystal sphere holding the fixed stars.
Its to make everyone happy with whoever came up with those many boundaries
Proud Member of the Infidels of OIF/OEF
No longer defending the US Military or US Gov't. Just going to ""**feed into your fears**"" with Duffel Blog Did not fight my way up on top the food chain to become a Vegan...
Warning: Stupid Allergy
Once you pull the pin, Mr. Grenade is no longer your friend
DE 6700
Harlequin 2500
RIP Muhammad Ali.
Jihadin, Scorched Earth 791. Leader of the Pork Eating Crusader. Alpha
Waiting for my shill money from Spiral Arm Studios
By the time it actually leaves the solar system it will have entered a dozen more
Self-proclaimed evil Cat-person. Dues Ex Felines
Cato Sicarius, after force feeding Captain Ventris a copy of the Codex Astartes for having the audacity to play Deathwatch, chokes to death on his own D-baggery after finding Calgar assembling his new Eldar army.
We're so screwed....on a side note that female Klingon officer not to bad looking....
Proud Member of the Infidels of OIF/OEF
No longer defending the US Military or US Gov't. Just going to ""**feed into your fears**"" with Duffel Blog Did not fight my way up on top the food chain to become a Vegan...
Warning: Stupid Allergy
Once you pull the pin, Mr. Grenade is no longer your friend
DE 6700
Harlequin 2500
RIP Muhammad Ali.
Jihadin, Scorched Earth 791. Leader of the Pork Eating Crusader. Alpha
d-usa wrote: Now we need to update this one again:
XKCD wrote:So far Voyager 1 has 'left the Solar System' by passing through the termination shock three times, the heliopause twice, and once each through the heliosheath, heliosphere, heliodrome, auroral discontinuity, Heaviside layer, trans-Neptunian panic zone, magnetogap, US Census Bureau Solar System statistical boundary, Kuiper gauntlet, Oort void, and crystal sphere holding the fixed stars.
Yea this same thread popped up in here a yearish ago....and maybe once before that as well. I was thinking the same thing, like "It left the Solar System.....again? But....I thought you could only do that once.....oooor not" I think they are just trying to keep people interested in it. Kind of like how last year NASA launched that thing at the moon to blast dust all over the place.....and talked up how cool it was going to look.....and we literally saw NOTHING
