This NASA visualization shows how something gradually reddens as it moves away from Earth.
LIGO physicists work with astrophysicists to chart the distance to the gravitational waves they measure using redshift and blueshift - relying on multiple paths to understand the merger of some of the most potent forces in the universe. Vitale does data analysis on gravitational waves (ripples in space-time) charted by the Laser Interferometer Gravitational-Wave Observatory (LIGO) following huge events like black hole mergers. To learn more about redshift and blueshift, Inverse spoke with Salvatore Vitale, an assistant professor of physics at the Massachusetts Institute of Technology. This is important for telescopes like the James Webb Space Telescope, which its stakeholders have tasked with learning about the earliest galaxies in the infant universe. These give essential clues on things like distance - and when staring at a distant galaxy, it lets you know how close you are to staring back at the dawn of time. Blueshift is the opposite, when light is shifted to shorter wavelengths on the blue side of the spectrum as an object comes towards us. That relies on two phenomena - redshift and blueshift.Īs objects move away from us, their light gets shifted into longer wavelengths or the red end of the spectrum - that’s redshift. When astronomers stare into the deep universe or at the spectra of a distant star subtly hiding an exoplanet, they need to account for its movement.
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