NGC 6333 (M9) is a globular cluster located 25,000 light years from the
Earth in the constellation Ophiuchus.
NGC 6333 (Globular Cluster, M9) : Picture
Renown 18th century astronomer Charles Messier described this 9th entry
in his famous astronomical catalog as "Nebula, without star, in the
right leg of Ophiuchus ...". But Messier 9 (M9) does have stars, known
to modern astronomers as a globular cluster of over 300,000 stars within
a diameter of about 90 light-years. It lies some 25,000 light-years distant,
near the central bulge of our Milky Way galaxy. This Hubble Space Telescope
close-up resolves the dense swarm of stars across the cluster's central
25 light-years. At least twice the age of the Sun and deficient in heavy
elements, the cluster stars have colors corresponding to their temperatures,
redder stars are cooler, bluer stars are hotter. Many of the cluster's
cool red giant stars show a yellowish tint in the sharp Hubble view.
This video zooms in from a wide field image of the night sky into globular
cluster Messier 9, ending on Hubble's image. Hubble's detailed image of
this star city resolves over 250,000 individual stars.
Pan across Messier 9
This video pans across Hubble observations of globular cluster Messier
9. This ball of stars is located towards the centre of our galaxy. A wide
palette of colours is visible here, a testament to the varied temperatures
of the stars in the cluster. Red stars are cooler, while blue ones are