Medium Deep Survey
![](https://cdn.sci.esa.int/documents/34247/35306/1567219554798-i_screenimage_15650.gif)
Depicts: Parts of the Hubble Medium Deep Survey
Copyright: Richard Griffiths (JHU), The Medium Deep Survey Team, and NASA
The bright blue regions indicate a rapid episode of star formation. Hubble reveals that these objects once far outnumbered large galaxies like our Milky Way, but have faded or self-destructed by today.
Last Update: 1 September 2019