04/02/2010 4004 views 10 likes. Galaxies come in different shapes and sizes. Scientists classify galaxies by shape. Galaxies. If confirmed, the finding highlights the importance to many galaxies of collisions and mergers in the recent past.

“NGC 3258 is the best target we’ve found, because we’re able to trace the disk’s rotation closer to the black hole than in any other galaxy.” Hurt. The universe's largest-known galaxies—giant elliptical galaxies—can contain up to a trillion stars and span two million light-years across. Back in 2015, a team of researchers demonstrated that giant elliptical galaxies could host approximately 100 planets.

Elliptical galaxies are reddish to yellowish in color because they contain mostly old stars.


The smallest elliptical galaxies are as small as some globular clusters. Hubble shows that the beautiful spirals galaxies of the modern Universe were the ugly ducklings of six billion years ago. Types of galaxies. The arms are made of gas, dust, and much younger stars. Where did today’s spiral galaxies come from? A major astrophysical mystery has centered on how massive, quiescent elliptical galaxies, common in the modern universe, quenched their once furious rates of star formation.
Our own Milky Way galaxy contains about 200 billion stars.. Types of Galaxies to a sample of 22 massive elliptical galaxies.

The bulge is a dense group of old stars.

The study showed that in the giant elliptical galaxies, there are not as many supernova rates as one can find in the Milky Way. Each of these main groups can be further divided into several sub-types. Elliptical galaxies are egg shaped. We combine our resonant scattering measurements with independent line broadening results to obtain the best constraints to date on the turbulent velocity amplitudes, Mach numbers and non-thermal pressure contributions in giant elliptical galaxies, providing bounded constraints for 13 objects. In addition to this, there are more stars around whom planets can orbit.

The three most common types of galaxies are spiral, elliptical, and irregular. “Our team has been surveying nearby elliptical galaxies with ALMA for several years to find and study disks of molecular gas rotating around giant black holes,” said Aaron Barth of UC Irvine, a co-author on the study. Galaxies are collections of stars, gas, and dust, combined with some unknown form of dark matter, all bound together by gravity.The visible parts come in a variety of sizes, ranging from a few thousand light years with a billion stars, to 100,000 light-years with a trillion stars. Giant elliptical galaxies can contain over a trillion stars. There are also some very rare and unique galaxy types that don’t appear to fit into the main groups at all. Galaxies come in four main types: ellipticals, spirals, lenticulars, and irregulars. SPIRAL GALAXIES A spiral galaxy has two parts: a central bulge and arms that form a spiral around the center.

ESA / Science & Exploration / Space Science.

Our home galaxy – the Milky Way Source NASA/JPL-Caltech/ESO/R.