GOODS-S field (NIRCam image, annotated)

How did the first stars and galaxies form? The NASA/ESA/CSA James Webb Space Telescope is already providing new insights into this question. One of the largest programs in Webb’s first year of science is the JWST Advanced Deep Extragalactic Survey, or JADES, which will devote about 32 days of telescope time to uncover and characterize faint, distant galaxies. While the data are still coming in, JADES already has discovered hundreds of galaxies that existed when the Universe was less than 600 million years old. The team also has identified galaxies sparkling with a multitude of young, hot stars.

This infrared image shows a portion of an area of the sky known as GOODS-South, which has been well studied by the NASA/ESA Hubble Space Telescope and other observatories. More than 45,000 galaxies are visible here.

Using these and other data, the JADES team has discovered hundreds of galaxies that existed when the Universe was less than 600 million years old. The sheer number of these galaxies was far beyond predictions from observations made before Webb’s launch. The team also has identified galaxies that existed during a time known as the Epoch of Reionization, when the Universe underwent a transformation from opaque to transparent. Many of these galaxies shown unusually strong emission line signatures due to the creation of multitudes of hot, massive stars.

In this image, blue, green, and red were assigned to Webb’s NIRCam (Near-Infrared Camera) data at 0.9, 1.15, and 1.5 microns; 2.0, 2.77, and 3.55 microns; and 3.56, 4.1, and 4.44 microns (F090W, F115W, and F150W; F200W, F277W, and F335M; and F356W, F410M, and F444W), respectively.