Current technology can't get us anywhere close to the speed of light (c); the Voyager probes are moving at something on the order of 1/17500 c. At speeds like that, it's about 75,000 years to Alpha Centauri. There are proposals for small probes accelerated by laser-driven light sails to speeds on the order of 15% of light speed -- 25 years to Alpha Centauri ...


Manned interstellar space flight is not going to happen anytime soon. Definitely not within the next 50 years, most likely not within the next 100. There are too many basic issues that are hard to work around. The biggest issue (apart from politics and funding) is propulsion. So far, nobody's figured out how to build an engine that doesn't require some ...


The JHUAPL Interstellar Mission proposal uses minimal development of current technology (mainly qualifying a large solid upper stage) to achieve a speed 4x higher than Voyager, so on the order of 18750 years to get to Alpha Centauri.


Yes, SETI has listened to Alpha Centauri. Here's a 2003 list of targets for SETI, which includes all of the 100 closest stars.


Welcome to Space Exploration Harry. I'm guessing you are talking about the Breakthrough Starshot proposals? The original idea was for a flyby of the target system because it was assumed that there would be no way to slow down the spacecraft once it had accelerated to 20% of the speed of light. As we know from Newton's First Law: An object at rest will ...


A sucessful flight of humans to mars and back might be possible in some years or some decades. But we don't have the technology for a human flight to the outer planets and their moons. Before we did not manage to send an orbiter to pluto and land a rover on pluto we are not able to leave our solar system with human passengers. We should send some spacecrafts ...


The British Interplanetary Society has spent some time looking at this, first with Project Daedalus 1973-78 taking 50 years to flyby Barnard's Star (5.9 ly) and in a high degree of technical detail in Project Icarus 2009-14 which spawned the Initiative for Interstellar Studies - i4is.org Numerous papers have been published as a result of this work.

Only top voted, non community-wiki answers of a minimum length are eligible