Currently Tech Allows Us To Travel 3.6AU Per Year.
To Leave The Solar System It Will Take:
74,000 years at 3.6AU Per Year.
AU Being the unit to calculate distance in space when talking about such a large distance (an Astronomical Unit).
1 AU = 93 million miles.
so 3.6 = 334.8 million miles.
Roughly 24,775,200 Miles to leave the solar system.
Light Speed = 186,282 miles per second.
Time At Light Speed = 132.998 seconds.

Traveling at light speed is theorised to turn matter into energy, as it's impossible for mass to travel at light speed. So actually using light speed is impossible.

That only leaves time dilation, which in itself is rediculous, as these numbers are just to make it to the border of our solar system, not to then traverse the emptyness and then enter and reach a planet in another solar system.

Even with time dilation used it would be HUNDREDS of thousand of years here. We would forget about it ^^.

I believe that it's silly to assume we're the only intelligent life form in this universe, but i think i can honestly say with absoloute certaintly we will NEVER, EVER see them - as light speed is impossible, and time dilation will only allow a few people to make it there, the planet would surely die out before they made it back with anything useful ^^.