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Combined observations from NASA’s NIRCam (Near-Infrared Camera) and Hubble’s WFC3 (Wide Field Camera 3) show spiral galaxy NGC 5584, which resides 72 million light-years away from Earth. Among NGC 5584’s glowing stars are pulsating stars called Cepheid variables and Type Ia supernova, a special class of exploding stars. Astronomers use Cepheid variables and Type Ia supernovae as reliable distance markers to measure the universe’s expansion rate.

Credits
Image: NASA, ESA, CSA, Adam G. Riess (JHU, STScI)
Image Processing: Alyssa Pagan (STScI)

Keywords: Variable Stars, Universe Age/Size