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This image shows the path taken by Voyager 1. While in the heliosphere which is the edge of a bubble around our solar system it was boosted by solar winds that travel at "supersonic speeds until [they cross] a shockwave called the termination shock," according to NASA. This is the dark blue area that Voyager 1 entered in December 2004.
The heliosheath (gray) is where the solar wind slows down and heats up. When Voyager 1 passed this area, it encountered interstellar winds, indicating it left the solar system. The area where the interstellar wind meets the heliosphere is called a bowshock and is indicated by the yellow area.
Here's a look at human-made spacecraft and their relative distance from the sun in 2011: Voyager 1 — 10.9 billion miles; Pioneer 10 — 9.6 billion miles; Voyager 2 — 8.8 billion miles; and Pioneer 11 — 7.8 billion miles. This map also shows the New Horizons spacecraft, which is about 2 billion miles from Earth, and on its way to Pluto.
As we indicated Voyager 1 is now about 16 billion miles from Earth while Voyager 2 is about 15 billion miles from Earth.
Bon voyage. The launch of Voyager 1.