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Time domain astronomy was highlighted as a key science area for the 2020s in the Astro2020 Decadal Review. Both HST and JWST have the potential to make significant scientific contributions in probing the variable universe at moderate and longer timescales. HST has the advantage of a 30-year legacy of observations spanning the broadest range of celestial sources, and JWST’s sensitivity at near- and mid-infrared wavelengths opens up opportunities in the high redshift universe. Phenomena include both photometric variations and astrometric motions.

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