The globular cluster NGC 6540 is located in the constellation Sagittarius. Astronomers made the image using
The instruments differ in their field of view:this affects how much of the sky each one captures. The new composite image shows a star-studded area of the sky captured by both instruments.
NGC 6540 is a stable globular cluster,a closely connected set of stars. The populations of these clusters range from tens of thousands to millions of stars. All of them are enclosed in a dense group due to mutual gravitational attraction.
The brightest stars in the image are decoratednoticeable cross-shaped light patterns known as diffraction bursts. These image artifacts are caused by the structure of Hubble, not by the stars themselves. The path that starlight takes when it hits the telescope is slightly disrupted by its internal structure, causing bright objects to be surrounded by flashes of light.
Hubble studied the heart of NGC 6540 so that astronomersmeasured the age, shape and structure of globular clusters in the center of the Milky Way. Gas and dust covering the center of the galaxy block some of the light from the clusters and also slightly change the colors of their stars. Globular clusters contain information about the earliest history of the Milky Way.
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