The stellar population in the nucleus, and a ring at an angular radius of 63, shows an age of only one billion years and is generally younger than the surrounding stellar population.
42.
The neutral and ionized gas in this galaxy are rotating in the same direction as the counter-rotating disk, and the stars in this group are generally younger than the main stellar population.
43.
The stellar population in the nucleus, and a ring at an angular radius of 63, shows an age of only one billion years and is generally younger than the surrounding stellar population.
44.
Both are noted for their nebulae and young stellar populations, but as in our own galaxy their stars range from the very young to the very old, indicating a long stellar formation history.
45.
Because galaxy formation in clusters is accelerated relative to the universe as a whole, cluster galaxies often fall along a " red sequence " of similar color characterized by old, evolved stellar populations.
46.
Gravity, primarily from unseen dark matter of an unknown nature, holds the ring of up to 500 million stars _ about the stellar population of small galaxies _ in a nearly circular orbit.
47.
Starting from the IMF, an assumption about the star formation history and using stellar evolution models, one can try to model the stellar populations in various environments of the Milky Way, but also in other galaxies.
48.
NICMOS allowed investigation of high redshift galaxies and QSO with high spatial resolution, which was especially useful when analyzed in conjunction with other instruments such as the STIS, and it also allowed deeper investigation of stellar populations.
49.
There is some question as to whether the GPs all started from the same starburst or if multiple starbursts went on ( much older stellar populations are hidden as we can't see the light from these ).
50.
GPs are very young galaxies, with models of the observed stellar populations indicating that they are around 10 ^ 8 ( one hundred million ) years old ( 1 / 100th the age of the Milky Way ).
