The Earth Surface Mineral Dust Source Investigation (EMIT) Imaging Spectrometer is a NASA Earth Venture Instrument (EVI-4) mounted to the exterior of the International Space Station (ISS). EMIT is the first instrument to use NASA-invented imaging spectroscopy technology to comprehensively measure the different wavelengths of light emitted by minerals on the surface of deserts and other dust sources to determine their composition.

In 2024, EMIT passed into an extended mission phase of operations, and will continue to collect data through at least 2026.