The Altar At the Center Of The Milky Way
Credit: ESO
Globular star clusters are among the oldest objects in the Universe, and NGC 6362 cannot hide its age in this picture. The many yellowish stars in the cluster have already run through much of their lives and become red giant stars. But globular clusters are not static relics from the past — some curious stellar activities are still going on in these dense star cities.
Credit: ESA/Hubble & NASA |
This video starts with a broad view of the Milky Way. We close in gradually on a fuzzy blob in the southern constellation of Ara (The Altar). This is one of more than 150 globular star clusters that orbit the centre of our galaxy. The main image of the cluster used here comes from the Wide Field Imager on the MPG/ESO 2.2-metre telescope at ESO’s La Silla Observatory in Chile and the final detailed view of the centre from the NASA/ESA Hubble Space Telescope.
Credit: ESO/NASA/ESA/Hubble, Nick Risinger (skysurvey.org), Digitized Sky Survey 2, Music: delmo “acoustic
Astronomers are keen to understand the secret of the youthful appearance of blue stragglers. Currently, there are two main theories: stars colliding and merging, and a transfer of material between two companion stars. The basic idea behind both of these options is that the stars were not born as big as we see them today, but that they received an injection of extra material at some point during their lifetimes and this then gave them a new lease of life.
Credit: ESO
Although less well known than some brighter globular clusters, NGC 6362 holds much that is of interest to astronomers and has been well studied over the years. It was selected as one of the 160 stellar fields for the Pre-FLAMES Survey — a preliminary survey conducted between 1999 and 2002 using the 2.2-metre telescope at La Silla to find suitable stars for follow-up observations with the VLT’s spectroscopic instrument FLAMES. The picture here comes from data collected as part of this survey.
Credit: ESO, Music: delmo “acoustic”
The new image shows the entire cluster against a rich background of the carpet of stars in the Milky Way. The central parts of NGC 6362 have also been [studied in detail][1] by the NASA/ESA Hubble Space Telescope. The Hubble view shows a much smaller area of sky in much greater detail. The two views — one wide-angle and one zoomed in — complement each other perfectly.
This brilliant ball of stars lies in the southern constellation of Ara (The Altar). It can be easily seen in a small telescope. It was first spotted in 1826 by the Scottish astronomer James Dunlop using a 22-centimetre telescope in Australia.
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