NASA's historic image, called Webb's First Deep Field, captured not only the galaxy cluster SMACS 0723, five billion light-years away, but also other, even more distant nebulae and galaxies visible in the background.

The most incredible thing is that, because the measure 'light-year' refers to the distance travelled by light in one year, the photograph shows us what these celestial bodies looked like exactly five billion years ago - the time it took for light to 'touch' the Earth's orbit, where the James Webb Space Telescope is located. In short, it was like pointing a camera lens back in time!