Satellites, télescopes, images

The geometry and structure of the Ring Nebula (Messier 57)

The geometry of MACS J0717

The glowing eye of NGC 6751

The growth of bulges in spiral galaxies

The globular cluster NGC 6388 observed by the MPGESO 2.2-metre telescope

The globular cluster NGC 6397

The evolution of the Hubble sequence

The exotic stellar population of Westerlund 1

The eponymous NGC 3783

The expanding Universe