The Earth is moving around the sun at ~30km/s. The escape velocity of the sun is ~42km/s. So if you start from Earth, it only takes 12km/s of change in velocity

The Earth is moving around the sun at ~30km/s. The escape velocity of the sun is ~42km/s. So if you start from Earth, it only takes 12km/s of change in velocity (called "delta-V" by rocket scientists / KSP players) to leave the solar system, but more than twice that (30km/s) to slow down enough to hit the sun.