While Proxima Centauri is the closest star overall, it's a red dwarf, much smaller and cooler than our Sun. The closest star similar to our Sun in spectral type is Alpha Centauri A.

Here's a breakdown:

* Proxima Centauri:

* A red dwarf star, about 1/8th the mass of our Sun.

* Located 4.24 light-years from Earth.

* While close, it's not a good candidate for harboring life due to its intense flares and proximity to the larger Alpha Centauri stars.

* Alpha Centauri A:

* A G-type star, similar to our Sun in size and temperature.

* Located 4.37 light-years from Earth.

* Part of a triple star system along with Alpha Centauri B and Proxima Centauri.

* It's a more promising candidate for hosting life, but it's slightly larger and hotter than our Sun.

While Alpha Centauri A is the closest Sun-like star, both it and Proxima Centauri are still extremely far away, making interstellar travel currently impossible.