The Voyager 1 probe was launched on September 5, 1977 and has been traveling for 11339 days or about 31 years. The Voyager 2 probe was launched on August 20, 1977 and has been traveling for 11346 days - 16 days longer than Voyager 1.
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Voyager 1 travelled closer to Jupiter and was given a boost from the planets gravity, a sling shot that now means it is the fastest and furthest man made object from Earth. As of 2011, it is around 116.4 Astronomical Units from the sun, where 1 Astronomical Unit is the distance between the sun and the Earth. Signals being sent from earth, travelling at the speed of light, take over 16 hours to reach the probe.
Voyager 1 has not left the solar system yet. The probe was launched about 32 years ago.
Voyager 1 and 2 were launched in 1977, and explored the outer planets during the 70's and 80's. They are still partially operational today, on their way out of our solar system.
At the moment - according to the Wikipedia article (see related link) it takes about 16 hours for signals sent from Voyager to reach Earth. At least that's what it says in the section titled 'Current Status'
A satellite traveling at typical speeds would take about 12 years to reach Neptune, which is about 4.3 billion kilometers away from Earth. The actual time can vary depending on the specific trajectory and speed of the satellite.
how long was the first radio telescope
It takes about 1 hour and 24 minutes for a radio signal to travel from Earth to Saturn when the two planets are at their closest point. This distance can vary depending on the positions of the two planets in their orbits.
A radio signal would take eleven years to reach a star that is eleven light years away. This is because the speed of light is the fastest speed at which any form of information can travel through space.