This image shows the closest image to the gorgeous spiral galaxy NGC 4603, located 100 million light-years away in the constellation Centaurus (The Centaur). The bright bands of blue young stars make up the arms of this galaxy, which flow lazily from the illuminated core. The intricate complex-red-brown filaments threading through the spiral arms are known as dust lanes, and consist of dense clouds of dust which obscure the diffuse starlight from the galaxy.
This galaxy is a familiar subject for Hubble. In the last years of the twentieth century, NGC observed closely and closely for the signs of a strange class of stars known as the 4063 keely variable.
These stars have a timelessness with which they darken and illuminate, allowing astronomers to accurately measure how far they are from Earth. Distance measurement from Cepheid variables is the key to measuring the longest distance in the universe, and it was one of the reasons why Georges Lemaître and Edwin Hubble showed that the universe is expanding
A NASA Hubble Space Telescope (HST) view of the gorgeous spiral galaxy NGC 4603, the most distant galaxy where a special class of pulsating star called the cephalic variable has been found. Related to the Centaurus cluster, it is one of the largest galaxies in the nearby universe. The local group of galaxies, of which the Milky Way is a member, is moving towards Centaurus at a speed of one million miles per hour due to the gravitational pull in that direction.
Clusters of young bright blue stars highlight the spiral forces of the galaxy. In contrast, red giant stars are also found in the process of dying. With the Hubble Space Telescope’s unparalleled ability to get detailed images of distant objects, only the brightest stars can be seen individually on the NGC 4603.
Most of the scattered illumination comes from the brazen stars that cannot be separated by Hubble. Red filaments are regions where dust clouds obscure blue light from the stars behind them.
This galaxy has been observed by a team associated with the HST Key project related to the extragalactic distance scale. Since the NGC 4603 is much farther away from Earth than the other galaxies studied by the Key Project team with Hubble, 108 million light-years, its stars appear extremely faint from Earth, so accurately measuring their brightness, as is required for distinguishing the characteristic variations of Cepheids, is extremely difficult.
At this distance some non-variable stars may become bright and faded in the same fashion as Cepheids because of the physical impossibility of accurate measurement of such faint objects. Determining the distance to a galaxy requires an unprecedented statistical analysis based on extensive computer simulations.
The researchers found 36-50 Cepheids and used their observed properties to safely determine the distance of NGC 460603. These measurements indicate that when calculated for the expansion of the universe and the motion of local groups, the Centaurus cluster is almost at rest compared to the surrounding regions.
This is one of the reasons for the rapid movement of matter into the nearby universe without being strongly drawn by other concentrations of matter. Observations of distant Cepheids, such as NGC 4603, help astronomers accurately measure the rate of expansion of the universe.