File:Messier2 - HST - Potw1913a.jpg

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The largest of its kind


Star clusters are commonly featured in cosmic photoshoots, and are also well-loved by the keen eye of the NASA/ESA Hubble Space Telescope. These large gatherings of celestial gems are striking sights — and the subject of this Picture of the Week, Messier 2, is certainly no exception.

Messier 2 is located in the constellation of Aquarius (The Water-Bearer), about 55 000 light-years away. It is a globular cluster, a spherical group of stars all tightly bound together by gravity. With a diameter of roughly 175 light-years, a population of 150 000 stars, and an age of 13 billion years, Messier 2 is one of the largest clusters of its kind and one of the oldest associated with the Milky Way.

This Hubble image of Messier 2’s core was created using visible and infrared light. Most of the cluster’s mass is concentrated at its centre, with shimmering streams of stars extending outwards into space. It is bright enough that it can even be seen with the naked eye when observing conditions are extremely good.

Credit:

ESA/Hubble & NASA, G. Piotto et al. 

Coordinates
Position (RA): 	21 33 27.20
Position (Dec):	0° 49' 21.79"
Field of view: 	2.43 x 2.44 arcminutes
Orientation:   	North is 12.8° right of vertical

Colours & filters Band	Wavelength	Telescope
Ultraviolet UV	275 nm	Hubble Space Telescope WFC3
Optical u	336 nm	Hubble Space Telescope WFC3
Optical B	438 nm	Hubble Space Telescope WFC3
.
日期 (Release)
来源 https://www.spacetelescope.org/images/potw1913a/ https://cdn.spacetelescope.org/archives/images/large/potw1913a.jpg
作者 Credit: ESA/Hubble & NASA, G. Piotto et al.
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当前2019年4月1日 (一) 04:342019年4月1日 (一) 04:34版本的缩略图3,678 × 3,697（7.73 MB）Fabian RRRR（留言 | 贡献）== {{int:filedesc}} == {{Information |Description='''The largest of its kind Star clusters are commonly featured in cosmic photoshoots, and are also well-loved by the keen eye of the NASA/ESA Hubble Space Telescope. These large gatherings of celestial gems are striking sights — and the subject of this Picture of the Week, Messier 2, is certainly no exception. Messier 2 is located in the constellation of Aquarius (The Water-Bearer), about 55 000 light-years away. It is a globular cluster, a...

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