Question

How long would it take for an astronaut to reach the closest star?

Answer 1

closest star is Proxima centuri,

Explanation:

It is about 4.3 llight years away. lighrt years is 9,460,528,400,000 kilometers..So mulitply this with 4.3 years.Maximum speed of our rockets are 23 KM/sec..Now calculate yourself.
NASa New horizons comaprison. In 2015, NASA's New Horizons probe completed its 3-billion-mile (4.8 billion km) journey to Pluto after traveling for about 9.5 years. The spacecraft traveled at speeds topping 52,000 mph (84,000 km/h). At that rate, it would take New Horizons about 54,400 years to reach Proxima Centauri.Aug 24, 2016
Part answer from Wikipedia.