The etiology of testicular pain is varied and is frequently idiopathic. Easily recognized and reversible causes include spermatocele, tumor, infection, varicocele, and torsion. Chronic orchialgia has been defined as at least 3 months of chronic or intermittent pain.
Bottom line: At 4.3 light-years away, the Alpha Centauri system is the nearest star system to our Earth and sun, but getting there would be extremely difficult. Read more about the Alpha Centauri system. Whoa! Earth-sized planet in Alpha Centauri system.
Proxima Centauri - Type=M5, Magnitude=11.0, Distance=4.22 ly. This dim red dwarf is the nearest star to the Sun, and it is a member of the Alpha Centauri system despite lying 0.24 light years from the main pair of stars, requiring over one million years to orbit them. Proxima was discovered in 1915 by Robert Innes and was at that time the least luminous star known.