The NASA/ESA Hubble Space Telescope has captured an amazing new photo of the intermediate spiral galaxy NGC 7038.
This Hubble image shows NGC 7038, a spiral galaxy some 220 million light-years away in the constellation of Indus. The color image is a composite of separate exposures acquired by Hubble’s Wide Field Camera 3 (WFC3) instrument. Image credit: NASA / ESA / Hubble / D. Jones / G. Anand / L. Shatz.
NGC 7038 is located approximately 220 million light-years away in the southern constellation of Indus.
Also known as ESO 286-79 and LEDA 66414, the galaxy was discovered on September 30, 1834 by the English astronomer John Herschel.
Along with the elliptical galaxy NGC 7014, NGC 7038 is one of the brightest members of the galaxy cluster Abell 3742.
“This image portrays an especially rich and detailed view of a spiral galaxy, and exposes a huge number of distant stars and galaxies around it,” Hubble astronomers said.
“That’s because it’s made from a combined 15 hours worth of Hubble time focused on NGC 7038 and collecting light.”
“So much data indicate that this is a valuable target, and indeed, NGC 7038 has been particularly helpful to astronomers measuring distances at vast cosmic scales.”
“The distances to astronomical objects are determined using an interconnected chain of measurement techniques called the cosmic distance ladder,” they added.
“Each rung in the ladder is calibrated by earlier steps, based on measurements of objects closer to us.”
“This makes the accuracy of distances at the largest scales dependent on how accurately distances to nearby objects can be determined.”
The astronomers used Hubble’s observations of NGC 7038 to calibrate two of the most common distance measurement techniques: Type IA supernovae and Cepheid variables.
“One of Hubble’s original science goals was to accurately establish distances to night-sky objects, and over its three decades of operation Hubble’s increasingly precise distance measurements have contributed to one of the most intriguing unsolved problems in astronomy,” they said.
“Distance measurements are used to derive a quantity known as the Hubble constant, which captures how fast the Universe is expanding.”
“As astronomer’s measurements of the Hubble constant have become more precise, its value has become increasingly inconsistent with the value of the Hubble constant derived from observations of the Big Bang’s afterglow.”
“Astronomers have been unable to explain the mismatch between the two values of the Hubble constant, which suggests that a new discovery in cosmology is waiting to be made.”
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