Examples of using Globular clusters in English and their translations into Hebrew
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Catalogue of 1116 Variable Stars in Globular Clusters.
Globular clusters are believed to be some of the oldest objects in the Universe and can usually contain millions of stars.
Explanation: M13 is one of the most prominent and best known globular clusters.
Globular clusters contain hundreds of thousands of stars and are among the oldest clusters of stars in the universe.
M53, also known as NGC 5024,is one of about 250 globular clusters that survive in our Galaxy.
Close inspection of the bulge in the above photographshows many points of light that are actually globular clusters.
Of the 200 or so globular clusters that survive today, Omega Centauri is the largest, containing over ten million stars.
Although they are difficult to find, black holes are fairly common in some parts of the Universe-but not in globular clusters.
Of the 200 or so globular clusters that survive today, Omega Centauri is the largest, containing over ten million stars.
Open clusters are younger, contain few stars, andcontain a much higher fraction of blue stars than do globular clusters.
However, black holes have proven so rare in globular clusters that until recently scientists assumed they must get kicked out shortly after they form.
In 1917, the astronomer Harlow Shapley made the first reliable estimate the Sun'sdistance from the galactic centre based on the distribution of globular clusters.
For her first year there,Hogg continued her work photographing globular clusters, amassing thousands of photographs which she used to identify many thousands of variable stars.
Open clusters of stars are younger, contain few stars, andcontain a much higher fraction of blue stars than do globular clusters of stars.
Their impressive size and age means globular clusters should produce lots of black holes similar in size to this one(which is about four times the mass of our Sun).
The authors noted that the newly detected structure resembles the characteristic"S-shaped"tidal feature found around other disrupting globular clusters, like Pal 5 and NGC 5466.
Although it appears that globular clusters contain some of the first stars to be produced in the galaxy, their origins and their role in galactic evolution are still unclear.
Helen Battles Sawyer Hogg, CC(1 August 1905- 28 January 1993)was an astronomer noted for pioneering research into globular clusters and variable stars.
By focusing on how the Milky Way affects its neighboring globular clusters, dense groups of stars smaller than a galaxy, scientists were able to calculate the mass of the Milky Way at varying distances.
During the late 1930s, Hogg became one of the first astronomers to travel andwork around the world to advance her research, as the globular clusters she was observing were best seen from the southern hemisphere.
Until recently, globular clusters were the cause of a great mystery in astronomy, as theories of stellar evolution gave ages for the oldest members of globular clusters that were greater than the estimated age of the universe.
It will enable astronomers to study in unprecedented detail fascinating objects such as supermassive black holes at the centers of distant galaxies,jets from young stars, globular clusters, supernovae, planets and their satellites in the solar system and much more.”.
Unlike many other globular clusters, the stars in Omega Centauri show several different ages and trace chemical abundances, indicating that the globular star cluster has a complex history over its 12 billion year age.”.
Seeking more examples of such clusters, a team of researchers led by Camila Navarrete of the Pontifical Catholic University ofChile searched for the presence of stellar tails around globular clusters located within the footprint of the Pan-STARRS1(PS1) 3Pi survey.
By analyzing pictures of globular clusters like the above image taken by the Hubble Space Telescope, astronomers use the abundance of stars like blue stragglers to help determine the age of the globular cluster and hence a limit on the age of the universe.
For example, it has been claimed that MOND offers apoor fit to the velocity dispersion profile of globular clusters and the temperature profile of galaxy clusters, that different values of a0 are required for agreement with different galaxies' rotation curves, and that MOND is naturally unsuited to forming the basis of a theory of cosmology.
However, greatly improved distance measurements to globular clusters using the Hipparcos satellite and increasingly accurate measurements of the Hubble constant resolved the paradox, giving an age for the universe of about 13 billion years and an age for the oldest stars of a few hundred million years less.