Despite the drop in interest rates, some high-yield savings accounts still offer around a 5% annual percentage yield (APY) — up from the pandemic-era rates of 1% and the highest since the 1990s.

The first stop on our journey is an unassuming little glimmer, a barely naked-eye visible star in Eridanus called Epsilon Eridani. At a little under 10½ lightyears away, Epsilon Eridani is in the ...