How long would it take to reach our nearest star with current technologies?
79,365 years, approximately
Alpha Centauri A is about 4.3 light years distant. Light travels about 6 trillion miles in one year which means that star is about 25 trillion miles away. Present technology can send a spacecraft into space at about 36,000 miles an hour or about 315,000,000 miles a year. Divide 25 trillion by 315 million and you get 79,365 years.