PIX4567648: Open cluster NGC 457 in Cassiopee - Open cluster NGC 457 in Cassiopeia - The NGC 457 cluster called the Owl cluster contains a hundred stars and is located 9900 years - light from Earth. NGC 457 contains nearly one hundred stars and is located 9900 light years from the Sun; it is also called the Owl Cluster, or the ET Cluster / Bridgeman Images
PIX4567809: Open cluster M34 in Persee - Open cluster M34 in Perseus - The cluster M34 (NGC 1039) contains a hundred stars; it is located about 1400 years - light from Earth. The open cluster M34 (NGC 1039) is at approximately 1,400 light - years away from Earth in the Perseus constellation. It contains about 100 stars / Bridgeman Images
PIX4567936: Open cluster M35 and NGC 2158 in Gemeaux - Open clusters M35 and NGC 2158 in Gemini - Open cluster M35 (NGC 2168) is visible to the naked eye under good conditions. NGC 2158, lower right, is weaker and is only observed at the telescope. M35 is about 2800 years of light from Earth and is about 110 million years old. M35 (NGC 2168), at left, is a spectacular large open cluster containing about 200 stars located in Gemini. Shining at magnitude 5, it is visible to the unaided eye off the foot of Gemini. It is accompanied by a jewel - like smaller companion, open cluster NGC 2158, seen at the lower right of the photo / Bridgeman Images
PIX4568046: Star cluster M46 and planetary nebula NGC 2438 - Open cluster M46 and planetary nebula NGC 2438 - M46 (NGC 2437) is an age cluster located at 5400 years - light. It contains about 500 stars, 150 of which are brilliant. It is about 300 million years old. The planetary nebula NGC 2438 (right) does not seem to belong to this cluster, and must be closer although its distance is unknown. M46 (NGC2437) is a rich open star cluster in the constellation Puppis. Within a diameter of 28 arc minutes, or about 30 light - years at its distance of 5400 light - years, M46 contains over 150 bright stars and a total population perhaps over 500. M46 is probably around 300 million years old. It is also noteworthy for the presence of the planetary nebula NGC 2438 on its northern edge (right of center). NGC 2438 is almost certainly not physically associated with M46 due to is probable evolutionary history, its significantly diffferent velocity, and a distance estimate only a little more than half the distance to M46 / Bridgeman Images
PIX4568236: Open cluster NGC 3293 in Carene - Open star cluster NGC 3293 in Carina - Star cluster located in the constellation Carene about 8500 years ago - light from Earth. Unlike the Sun, many stars are found in brilliant clusters such as NGC 3293 where they spend their lives. At birth, which should have been at much the same time for all the stars in NGC 3293, the most massive stars are hot and very luminous and therefore appear as the brightest blue stars. With time they deplete their supplies of nuclear fuel, hydrogen. This evolutionary process involves cooling, so that the stars become redder, and would ordinarily disappear from view, but they also swell to gigantic proportions and so remain visible. The bright orange star in NGC 3293 is the member of the cluster which has aged fastest. This cluster is in the constellation of Carina at a distance of about 8500 light years / Bridgeman Images
PIX4568246: Open cluster NGC 4755 - Jewel Box - The Jewel Box star cluster - The NGC 4755 cluster is located in the constellation of the Southern Cross at a distance of 6400 years - light from Earth. The bright orange star on the top right is Kappa Crucis, a supergiant red star. This cluster contains about fifty stars formed about 16 million years ago. This close-up of the center of the cluster was obtained with the Hubble Space Telescope. This image is a “” close - up 'view from the NASA/ESA Hubble Space Telescope of NGC 4755, or the Jewel Box cluster. Several very bright, pale blue supergiant stars, a solitary ruby - red supergiant and a variety of other brilliantly coloured stars are visible in the image, as well as many much fainter ones, often with intriguing colours. The huge variety in brightness exists because the brighter stars are 15 to 20 times the mass of the Sun, while the dimmest stars are less than half the mass of the Sun. This is the first image of an open galactic cluster with imaging extending from the far ultraviolet to the near - infrared. NGC 4755 (Caldwell 94) is called the Jewel Box, based on John Herschel's comment in the 1830's that it looked like a superb piece of jewelry. There are about 50 stars in this cluster which formed some 14 million years ago. Most of the cluster members are blue giants which in a few million years will exhaust their hydrogen fuel and become red giants on their way to a cataclysmic end as supernovae. One red giant can already be seen at the center of the cluster (top right) / Bridgeman Images