Alternatively, elliptical galaxies — what Hubble called early-type galaxies — appear to be older. Instead of rotating, like disk galaxies, stars in elliptical galaxies have more random movement, according to Robert Bassett, an observational astrophysicist who studies galaxy evolution at Swinburne Univ...
The same physical forces also affect the look of the pointed "arms" that can be seen around the rims of such galaxies. "The types of spiral arms are almost certainly related to the rotation rate," GuhaThakurta says. Rapidly rotating systems tend to have a ring of small, tight arms. In...
Those rings are pretty exciting places themselves. Inside of them there are bound to be “lumps” of higher density that draw in surrounding material. Eventually this turns into smaller accretion disks within the larger disk. Our solar system formed as a disk with all of the planets ...
Croom and van de Sande's team conclude that the blame for the random stellar motions seen in older galaxies can be laid firmly at the feet of a combination of age-related effects. One is stars that are born "hotter" (meaning they are too energetic to adopt boring circular orbits) early ...
What this means is that space and time are connected – if you move really fast through space, time slows down for you compared to someone who is moving slowly. This is why astronauts – who are moving very fast in space –age a tiny bit more slowly than people on Earth. ...
Experimental/ clusters of galaxiescosmologydark energyrotating bodies/ Hubble flowcosmological expansionobservation horizonLocal Volumegalaxy motionsLocal Groupdynamical modelsThe problem of the physical nature of the Hubble flow in the Local Volume ( D < 10 Mpc) stated by Sandage is studied. New ...
Why do books say that the farthest galaxies we can see in opposite directions are not within each other's visible universe, when Einstein's addition of velocities law shows that any two velocities add up to a velocity less than that of light? Assume that you are standing...
Find out all about these elusive ripples in space-time and why the latest detection has astronomers celebrating.
Why are old, large craters on Ganymede and Callisto much shallower than those on the Moon?Lunar Craters:Naked eye observation of our own Moon reveal dark grey patches, roughly circular in shape, against the bright white background of the Moon. These are craters, created...
The Milky Way, our cosmic home, contains between 100 and 400 billion stars. The galaxy is thought to have formed 13.6 billion years ago, originating from a rotating cloud of gas composed of hydrogen and helium. The gas then accumulated over billions of years in a rotating disk, where stars...