TODAY IN THE HISTORY OF PSYCHOLOGY
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20 novembro 2016
NGC 4414: A Flocculent Spiral Galaxy
How much mass do flocculent spirals hide? The featured true color image of flocculent spiral galaxy NGC 4414 was taken with the Hubble Space Telescope to help answer this question. The featured image was augmented with data from the Sloan Digital Sky Survey (SDSS). Flocculent spirals -- galaxies without well-defined spiral arms -- are a quite common form of galaxy, and NGC 4414 is one of the closest. Stars and gas near the visible edge of spiral galaxies orbit the center so fast that the gravity from a large amount of unseen dark matter must be present to hold them together. Understanding the matter and dark matter distribution of NGC 4414 helps humanity calibrate the rest of the galaxy and, by deduction, flocculent spirals in general. Further, calibrating the distance to NGC 4414 helps humanity calibrate the cosmological distance scale of the entire visible universe.
from NASA http://ift.tt/2gsbMns
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The 22nd Amendment to the US Constitution, which delays laws affecting Congressional salary from...
The 22nd Amendment to the US Constitution, which delays laws affecting Congressional salary from taking effect until after the next election of representatives, took 202 years to pass. It was in Congress from Sept 25, 1789 until May 5, 1992.
The oldest living vertebrate (that we know of) is the Greenland Shark, who is estimated to be around...
The oldest living vertebrate (that we know of) is the Greenland Shark, who is estimated to be around 400 years old. Although they could be as old as 512!
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