The distances between stars are vast, which is why star travel is so far. Read here about conventional propulsion and warp drives, plus about Breakthrough Starshot’s new idea to send nanostarships to Alpha Centauri.
The nearest known exoplanet – orbiting the star Proxima Centauri – is only 4.2 light-years away. Does it have liquid water? An atmosphere? Weather? Scientists just announced the first tentative steps to explore those possibilities.