I think in 50 years we will find a Earth like planet outside this solar systemIt's going to be almost impossible to find Earth-like planets without actually venturing out there to find them. They're too small and too far away.
I hate to say it, but barring a revolution in physics (along the lines of anti-gravity) 50 years may be a bit optimistic.
"It's going to be almost impossible to find Earth-like planets without actually venturing out there to find them. They're too small and too far away."
Interferometry with a baseline distance of Jupiter's orbit could give us the needed resolution.