Hubble Observes NGC 6397 in Our Milky Way (Artist’s Concept)

Faintest Stars in Globular Cluster NGC 6397

Looking like glittering jewels, the stars in this Hubble Space Telescope image at left are part of the ancient globular star cluster NGC 6397. Scattered among these brilliant stars are extremely faint stars. Hubble's Advanced Camera for Surveys has taken a census of the cluster...

Globular Cluster NGC 6397

Faint White Dwarf Star in Globular Cluster NGC 6397

Faint Red Star in NGC 6397

Tale of Two Stellar Populations in Globular Cluster NGC 6397

This graph schematically plots two populations of stars Hubble has seen in a neighboring star cluster. The graph, a simplified version of the original data, plots stellar brightness (vertical axis) against stellar color-temperature. The normal main sequence stars in the cluster...

Location of ACS detail in NGC 6397

Globular Cluster NGC 6397 taken in red light by the UK Schmidt Telescope of the Anglo-Australian Telescope. The green rectangle to the left and below the bright central of the cluster shows the location of the detailed image made by Hubble Space Telescope's Advanced Camera for...