Astro-Challenge: What’s so Special About 51 Pegasi?

It’s hard to imagine a time before we knew of worlds beyond our own solar system. These days, extra-solar (or “exoplanets”) are back page news, as discoveries occur almost daily.  But scant decades ago (Waaay back in the pre-Internet Stone Age of the early 1990’s) no exoplanets were known, and the entire field was open [...]