Eta

Its story

In tiny Sagitta — the Arrow that barely spans five degrees from tip to tip — this orange giant glows from 160 light-years away. The constellation is one of the oldest recognised: Ptolemy already included it in the 2nd century, and the Greeks linked it to the arrows of Hercules or Apollo. Its warm light crosses the dense star field of the summer Milky Way, where on a clean night every point seems part of a silent multitude.