The James Webb Space Telescope is gazing across the universe to find galaxies close to the “cosmic dawn”—and you can explore them from the palm of your hand
That poetic phrase is what astronomers call the time just a few hundred million years after the big bang when the very first stars switched on, flooding the cosmos with light.
This is precisely why astronomers built the James Webb Space Telescope . With its huge 6.5-meter segmented mirror and multiple infrared-attuned instruments, it can see galaxies as they were not too long after the first stars were born and possibly maybe even all the way back to the cosmic dawn. A scattering of stars in our own galaxy can be distinguished here and there in the JADES field. Each of them stands out from objects far more distant via its very sharp, pointlike appearance, as well as the presence of diffraction spikes—three pairs of lines that radiate away from a star’s center and are caused by the bending of light around the hexagonal one-meter mirror segments that make up JWST’s primary mirror.
Many of the astronomical objects in this mosaic can be identified by their color, that is, how bright they appear at different wavelengths. The Near-Infrared Camera, JWST’s workhorse instrument, has filters that select for different wavelengths, several of which are used by JADES. You can switch the display between filters by clicking the top “layers” icon in the upper right corner of the mosaic’s webpage to see how appearances change when you change what flavor of light is observed.
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