This dazzling globular cluster, classified as NGC 6544, captured by Hubble lies more than 8,000 light-years from Earth in the constellation Sagittarius, near the vast Lagoon Nebula. The latter is a nebula of epic proportions, measuring 55 light-years across and 20 light-years from top to bottom.
What you see here is a combination of data from two of Hubble’s instruments, the Advanced Camera for Surveys and Wide Field Camera 3, along with two separate astronomical observations. The first one was designed to find a visible counterpart to the radio pulsar discovered in NGC 6544. A pulsar refers to the rapidly spinning remnant of a dead star, emitting twin beams of electromagnetic radiation like a vast astronomical lighthouse.
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The second observation which contributed data to this image was also designed to find the visible counterparts of objects detected at other electromagnetic wavelengths. Instead of matching up sources to a pulsar, however, astronomers used Hubble to search for the counterparts of faint X-ray sources. Their observations could help explain how clusters like NGC 6544 change over time,” said the ESA.
