The Hubble Space Telescope team has released another stunning space image captured by the instrument – this of a globular cluster called NGC 1805. A globular cluster is an enormous collection of thousands of stars that are close together and bound by a spherical shape that powers the Gravity.
The stars in NGC 1805 are so densely packed that they are unlikely to have planetary systems. These stars are between 100 and 1000 times closer to each other than our sun is to other stars.
In this image of the globular cluster NGC 1805, captured by NASA / ESA's Hubble Space Telescope, many brightly colored stars are packed close together. ESA / Hubble & NASA, J. Kalirai
This image is an example of Hubble's ability to capture light not only in the optical wavelength, but also in the ultraviolet and infrared wavelengths. The Hubble scientists explain: “(t) The striking difference in star colors is beautifully depicted in this image, which combines two different types of light: blue stars, which are brightest in nearby ultraviolet light, and red stars, which are red and Near-infrared are illuminated in red. Space telescopes like Hubble can observe in the ultraviolet because they are located above the Earth's atmosphere, which absorbs most of this wavelength and is inaccessible to ground-based facilities. "
The global cluster shown here is located near the edge of the Large Magellanic Cloud, one of the galaxies closest to the Milky Way. It is gravitationally bound to our galaxy, hence it is known as a satellite galaxy. The region in question is part of the Dorado constellation, named after the Portuguese term for dolphin fish, which can be observed from the southern hemisphere.
This particular globular cluster is distinguished by an unusual feature that contains both older and younger stars. "Usually globular clusters contain stars that are born at the same time," said the Hubble scientists. "NGC 1805 is unusual, however, in that it appears to harbor two different populations of stars millions of years old." Observing such star clusters can help astronomers understand how stars evolve and what factors determine whether they end their lives as white dwarfs or explode as supernovae. "
Hubble previously recorded another globular cluster, Messier 62, which also has the unusual feature that it is extremely dense in its center.