Star-forming spiral galaxies spotted by the Hubble Space telescope

The Hubble Space Telescope has collected photographs of two spiral galaxies known as Arp 303 as a cluster. They are more than 275 million light-years away in the direction of the constellation Sextans, and are classified as IC 563 (bottom) and IC 564 (top).

The image is generated combining data from two Hubble exposures of Arp 303. Infrared data from Hubble’s Wide Field Camera 3 (WFC3) was utilized to examine the pair’s star-forming zones in the first observation. At infrared light wavelengths, galaxies like IC 563 and IC 564 are extraordinarily brilliant, and they include numerous bright star-forming areas.

Hubble’s Advanced Camera for Surveys (ACS) was deployed in the second observation to take rapid observations at bright fascinating galaxies all through the sky. These new observations filled in blanks in Hubble’s archives as the ship explores for intriguing candidates to investigate further with Hubble, the James Webb Telescope, and other facilities.

Most galaxies are comprised of clouds of dust and gas that generate stars. Turbulence inside some clouds produces “knots” of sufficient mass to collapse under their own gravitational attraction, allowing the gas and dust to collapse. The material in the centre of these clouds begins to heat up as they collapse.

A protostar is a hot core in the centre of collapsing clouds that will subsequently become a star. The whirling clouds of contracting gas and dust may break up into two or three blobs, so according computer simulations of star formation. This might explain why the Milky Way’s majority of stars are paired or in clusters of numerous stars.

Image Credit: NASA, ESA, K. Larson (STScI), and J. Dalcanton (University of Washington)

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