Everything We Know About The European Telescope Creating A 3D Map Of The Entire Galaxy - SlashGear

While missions like Hubble and the upcoming James Webb Space Telescope look in detail at particular targets, other missions have a broader aim.

Gaia gathers data about the composition of far-off stars using a technique called spectroscopy, with its instrument called the Radial Velocity Spectrometer (via ESA). Spectroscopy works by breaking d… [+1489 chars]

full article...