the sun is approximately 150 million km or 93 million miles away, a distance that is known as the “astronomical unit” (AU). Neptune, the most distant planet, is 30 AU from the sun, or some 44.8 billion km (27.9 billion mi). The Voyager 2 spacecraft, launched in 1977, reached Jupiter just two years later, but did not reach Neptune until 1989.
The nearest stars, Alpha Centauri A-B and Proxima Centauri, are roughly 1000 times more distant, roughly 4.3 light-years away (one light-year is the distance that light travels in a Julian year of 365.25 days, namely 9.461 trillion km or 5.879 trillion mi