Two new papers based on star survey data highlight the tremendous capabilities of modern astronomical survey technologies.
Robert F. Bukaty/AP
On 11 November 1572, the Danish nobleman Tycho Brahe plotted on his map of the star-salted skies a flash of light, brighter than a planet, in the W-shaped constellation Cassiopeia. He called it “Stella Nova.” It would later be called a supernova, or SN 1572.
The celestial world above, it would later unfold in Brahe’s subsequent star catalogues, was inconstant. Stars were born, and stars died. And it was possible, Brahe found, to chart the evolution of the universe, mapping the cataclysmic events of deep space as denotations of what spot of light was there one night and what spot of light was gone the next.
Since Brahe’s star maps, sky surveys have underpinned astronomical research. Over the last 440 years or so, they have stippled in maps of local galaxies, supplied the data for revisions in how we think the universe operates, and turned up new stars, galaxies, and other celestial regions and objects. And now, these surveys are better than ever before.