HST image of hot blue stars at the core of M15

A NASA/ESA Hubble Space Telescope (HST) image of the center of globular cluster M15 reveals a new population of about 15 very hot stars isolated at the core.

The most likely explanation for their existence is that they are the 'naked cores' of stars that have been stripped of their outer envelope of gas. This could only have happened if stars were so crowded together in the cluster's core they can gravitationally pull material form each other.


G. De Marchi (STScI and Univ. of Florence, Italy) and F. Paresce (STScI)/NASA, ESA.

About the Image

NASA press release
Release date:9 June 1993, 06:00
Size:2616 x 2190 px

About the Object

Name:M 15, Messier 15, NGC 7078
Type:Milky Way : Star : Grouping : Cluster : Globular
Distance:35000 light years
Category:Star Clusters

Image Formats

Large JPEG
1.4 MB
Screensize JPEG
128.8 KB


Position (RA):21 29 58.49
Position (Dec):12° 9' 56.11"
Field of view:0.19 x 0.16 arcminutes
Orientation:North is 154.9° right of vertical

Colours & filters

Optical Hubble Space Telescope

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