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I was reading Wikipedia which stated

....Voyager 1's current relative velocity is 17.062 km/s, or 61,452 kilometres per hour (38,185 mph).....

It travels away from sun. So sun's gravity must slow it down. What propels Voyager to that speed?

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up vote 6 down vote accepted

Rocket fuels initially, followed by a series of gravitational assists (slingshots): http://en.wikipedia.org/wiki/Gravity_assist The linked article mentions Voyager 1 mission as an example.

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i guess some other body in the space is pulling it towards itself and because it has been travelling since very long time, it could have achieved that acceleration. it's just a hypothesis of mine

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