Use the wavelength slider below to smoothly transition between different infrared wavelengths and explore how W51-IRS2 appears across the spectrum. This massive young stellar object reveals different features at different wavelengths: shorter wavelengths (1.4-2.1 μm) show scattered starlight and cooler dust, while longer wavelengths (3.35-4.8 μm) trace warmer dust and reveal emission from polycyclic aromatic hydrocarbons (PAHs). Slide from short to long wavelengths to see the changing view!