What are galaxies?The Galaxies of the Local Group by Sidney van den Bergh, Cambridge Astrophysics Series; The Formation of Galactic Bulges eds C M Corollo, H C Ferguson and R F G Wyse, Cambridge Contemporary Astrophysics.BinneyJamesEBSCO_AspAstronomy & Geophysics
1. In our solar system eight planets go aroun d the sun. What are土星: Saturn, 以罗马神话中的农神萨杜恩命名, 希腊神话they? Can you name them?在我们的太阳系中, 有八颗行星称其为 “克洛诺斯” 。围绕太阳运转。 它们都有哪些?你能说出它们的名字吗?天王星:Uranus,以希腊神话中宙斯的祖父乌拉诺斯...
What are the two types of radio galaxies? There are two distinct types of radio galaxies defined by differences in their optical emissions. Broad-line radio galaxies show broad-line light emissions from ionized oxygen, hydrogen, and silicon in their optical spectrum. Narrow-line radio galaxies are...
“But these six galaxies are fast-tracking to maturity. Why this is the case or how this works is unknown."According to the report, which was published in the journal Nature on Wednesday,each of the six objects weighs billions of times more than our sun. In one of them the total ...
The majority of bright early-type galaxies in this field are found at redshifts $z \\leq 1.3$ to share common properties with those of high-z cluster samples, as for the age and mass of the dominant stellar population -- which are found to be as old as 3-5 Gyr and as massive as...
We categorize the galaxies of the universe into three different main types: spiral, elliptical, and irregular galaxies.Answer and Explanation: Spiral galaxies are made of stars, planets, moons, asteroids, comets, black holes, dust, gas, and any other type of stellar object found in any......
While the new telescope has spotted even older galaxies, dating to within 300 million years of the beginning of the universe, it's the size of these six galaxies that shocked the researchers."Most galaxies in this er a are still small and only gradually growing larger over time, " lead ...
Here are a few key lines of evidence for dark matter: 1.Galaxy rotation curves When astronomers measure how fast stars orbit the centers of galaxies, they find something strange. The stars at the edges of galaxies are moving much faster than they should be if only visible matter were present...
galaxies.While the new telescope has spotted even older galaxies, dating to within 300 million years of the beginning of the universe, it's the size of these six galaxies that shock the researchers.“Most galaxies in this er a are still small and only gradually growing larger over time," ...
But star clusters are notgalaxies, which, confusingly, are also gravitationally bound groups of stars. "The most straightforward differentiation would be whether a group of stars is bound together by their own gravity or if you need to have dark matter included in that cluster in order to keep...