This globular lies about 35 light-years from the Earth, in the constellation of Pegasus The Flying Horse. Astronomers think that particularly dense globulars, like this one, underwent a process called core collapse, in which gravitational interactions between stars led to many members of the cluster migrating towards the centre.
Messier 15 is also the first globular cluster known to harbour a planetary nebula, and it is still one of only four globulars known to do so. The total exposure times were s and s respectively and the field of view is 3. M15 is believed to be 12 billion years old, which makes it one of the oldest globular clusters known.
It contains more than , stars, among them a significant number of variables and pulsars, including the double neutron star M15 C. The cluster is also home to Pease 1, a planetary nebula discovered in Pease 1 was the first planetary nebula discovered within a globular cluster.
The nebula has an apparent magnitude of They lie about million light years from Earth. Four of the five galaxies were the first compact galaxy group ever discovered.
The brightest galaxy in the group is NGC , which is only 40 million light years distant. The other four galaxies in the group form a physical association, the Hickson Compact Group 92, and will eventually merge. A clash among members of a famous galaxy quintet reveals an assortment of stars across a wide color range, from young, blue stars to aging, red stars.
The name, however, is a bit of a misnomer. Studies have shown that group member NGC , at upper left, is actually a foreground galaxy about seven times closer to Earth than the rest of the group. Three of the galaxies have distorted shapes, elongated spiral arms, and long, gaseous tidal tails containing myriad star clusters, proof of their close encounters. These interactions have sparked a frenzy of star birth in the central pair of galaxies. This drama is being played out against a rich backdrop of faraway galaxies.
NGC is a spiral galaxy 39 million light years distant. It has a visual magnitude of The galaxy is not part of the Hickson Compact Group, but is located in the same line of sight as the other four galaxies. NGC has an apparent magnitude of It is 0. Their apparent magnitudes are NGC is a spiral galaxy approximately million light years distant.
It has an apparent magnitude of A quasar was discovered in the heart of the galaxy in January and its light spectrum suggests that it is billion of light years distant, which caused some controversy because the galaxy is believed to be much closer to us.
However, too many quasars have been discovered that were closely associated with galaxies significantly less distant than that. NGC is an elliptical galaxy in Pegasus. It is 1. NGC is an unbarred spiral galaxy in Pegasus, seen face-on. The galaxy is notable for having a ring, but no bar, which would normally produce the ring structure in the galaxy. The ring structure in NGC may be the result of a merger with a small, gas-rich dwarf galaxy, and the exceptionally bright central region and some of the gas rotating in the opposite direction are some of the features that suggest this may have been the case.
NGC has a visual magnitude of NGC is a spiral galaxy with a visual magnitude of The galaxy was discovered by the German-born British astronomer William Herschel in It has a similar structure and size to the Milky Way. NGC is an unbarred spiral galaxy with an apparent magnitude of It is 3. The galaxy is a gas-poor system. It has several rings of stars of which the outermost is most prominent and contains most of the gas and star forming activity in NGC NGC is a disturbed spiral galaxy with a visual magnitude of It is a starburst galaxy; one that has recently experienced intense star forming activity.
The galaxy is approximately million light years distant. NGC 23 is a bright spiral galaxy in Pegasus. The galaxy lies approximately million light years from the solar system. The phenomenon of gravitational lensing is one of the effects predicted by the general theory of relativity and was originally postulated by Albert Einstein once he realized that gravity would be able to bend light. The brightest is Enif with a visual magnitude of 2. It is an orange supergiant star that is 5, times brighter than the Sun and has times its radius.
Enif is located light years from Earth. Scheat is the second brightest star with a magnitude of 2. Scheat is a red giant star that lies about light years from our solar system. At magnitude 2. It is blue giant star located approximately light years away. It is a globular star cluster that contains more than , stars.
It is one of the oldest globular clusters known. It is 33, light years from Earth and is thought to be over 12 billion years old.
Pegasus also contains a number of dim galaxies that can only be seen in large telescopes. Actively scan device characteristics for identification. Use precise geolocation data. Select personalised content. Create a personalised content profile. Measure ad performance.
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Develop and improve products. List of Partners vendors. Share Flipboard Email. Carolyn Collins Petersen. Astronomy Expert. Carolyn Collins Petersen is an astronomy expert and the author of seven books on space science.
She previously worked on a Hubble Space Telescope instrument team. Facebook Facebook. Updated September 13, Featured Video. Cite this Article Format.
Petersen, Carolyn Collins. How to Spot the Pegasus Constellation. How to Spot the Scorpius Constellation.
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