NASA's Webb Telescope Is Nearing Detection of 'Cosmic Dawn'

According to astronomer Richard Ellis, a famous professor of astrophysics at University College London and the author of the recently published book "When Galaxies Were Born: The Quest for Cosmic Dawn."

Ellis has helped bring in a new age of galactic astronomy during the course of his six-decade career. In total, he has spent approximately 800 nights at some of the world's top ground-based optical observatories. 

Ellis informed me over the phone from London. Second, he claims that these early objects seem to be fundamentally distinct from later galaxies. 

The discovery of these early galaxies that are brighter than predicted and aggressively generating stars is perhaps the most significant findings so far, he adds.

According to Ellis, the light from those early galaxies has been extended into the infrared area, where Hubble does not have coverage. So, after only six months, from the initial Webb scientific findings.

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There are two main ways for calculating the distance to these distant galaxies. One method is to use optical photometry to determine the colour of galaxies. 

 In general, galaxies at cosmic distances seem redder because the light is stretched into the infrared region of the electromagnetic spectrum. However, ground- or space-based spectroscopy may provide a more exact means of determining .

Spectroscopy, whether conducted on the ground or in space, is capable of providing a more accurate way for determining the distance to a particular galaxy.

The atomic emission and absorption chemical spectra of a target galaxy are measured with the use of a spectrograph as the first stage in the process.

Then, in turn, its estimated distance (or red shift) may be computed by comparing the redshifted atomic lines being detected in the galaxy with the known laboratory reference spectra.

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