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If the high velocity-profile width of VIRGOHI21 is interpreted as rotation, it is far too fast to be consistent with the gravity of the detected hydrogen. Rather, it implies the presence of a dark matter halo with tens of billions of solar masses.
Sensitive maps covering a much wider area, obtained at Westerbork Synthesis Radio Telescope (WSRT) and at Arecibo Observatory revealed VIRGOHI21 is embedded within a much more extensive tail originating in NGC 4254. Both the distribution of the HI gas and its velocity field can be reproduced by a model involving NGC 4254 in a high-speed collision with another galaxy (probably NGC 4192), which is now somewhat distant. Other debris tails of this magnitude have been found to be common features in the Virgo cluster, where the high density of galaxies makes interactions frequent. These results suggest that VIRGOHI21 is not an unusual object, given its location at the edge of the densest region of the Virgo cluster.
Originally posted by Deny Arrogance
I wasn't aware that anybody has actually discovered "dark matter" itself.
And here they find a whole galaxy of it?
Originally posted by np6888
Anything that exerts a gravitational force can be considered matter. In other words, matter is a quantifiable amount of energy that also exerts a force. In order for us to see this matter with ordinary light, IMO, this energy has to coalesce to a wavelength of more than 350 nm(or vibrating at less than 1 "petahertz", or 1 million billion cycles per second, at least that is my new theory.)
Originally posted by np6888
Well, from what I've gathered, energy is something required to do work or to change speed or states. In other words, energy can simply be think of as a force, and indeed if F = ma and E = mc'2, then F = Ea/c'2(all "intangibles").
In physics, energy (from the Greek ἐνέργεια - energeia, "activity, operation", from ἐνεργός - energos, "active, working") is a scalar physical quantity that describes the amount of work that can be performed by a force, an attribute of objects and systems that is subject to a conservation law. Different forms of energy include kinetic, potential, thermal, gravitational, sound, light, elastic, and electromagnetic energy. The forms of energy are often named after a related force.
In physics, the concept of force is used to describe how a massive body is affected by acceleration or mechanical stress. Force can also be described by intuitive concepts such as a push or pull that can cause an object with mass to change its velocity (which includes to begin moving from a state of rest), i.e., to accelerate, or which can cause a flexible object to deform. Related concepts to accelerating forces include thrust - any force which increases the velocity of the object, drag - any force which decreases the velocity of any object, and torque - the tendency of a force to cause changes in rotational speed about an axis. Alternatively, mechanical stress is a technical term for the efforts which cause deformation of matter, be it solid, liquid, or gaseous. While mechanical stress can remain embedded in a solid object, gradually deforming it, mechanical stress in a fluid determines changes in its pressure and volume.
In physics, mass–energy equivalence is the concept that the mass of a body is a measure of its energy content. The mass of a body as measured on a scale is always equal to the total energy inside, divided by a constant c2 that changes the units appropriately: