Astronomy Picture of the Day
    


NGC 4414: A Flocculent Spiral Galaxy
<< Yesterday 20.11.2016 Tomorrow >>
NGC 4414: A Flocculent Spiral Galaxy
Credit & Copyright: NASA, ESA, W. Freedman (U. Chicago) et al.,
& the Hubble Heritage Team (AURA/STScI), SDSS; Processing: Judy Schmidt
Explanation: 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.

Free Download: APOD 2017 Calendar: NASA Images

January
February
March
April
May
June
July
August
September
October
November
December
 < November 2016  >
Mo Tu We Th Fr Sa Su

123456
78910111213
14151617181920
21222324252627
282930



Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (USRA)
NASA Web Site Statements, Warnings, and Disclaimers
NASA Official: Jay Norris. Specific rights apply.
A service of: LHEA at NASA / GSFC
& Michigan Tech. U.

Based on Astronomy Picture Of the Day

Publications with keywords: spiral galaxy - NGC 4414
Publications with words: spiral galaxy - NGC 4414
See also:
All publications on this topic >>