There are several different kinds of redshift that we encounter in the universe. Those three are ‘gravitational’, ‘doppler‘ and ‘cosmological‘. Before looking at two examples, it is best to have a ...

Cosmological redshift depends upon a galaxy's distance. Credit: NASA/JPL-Caltech/R. Hurt (Caltech-IPAC) In 1929 Edwin Hubble published the first solid evidence that the universe is expanding. Drawing ...

RECENT spectral surveys of discrete radio sources have not revealed any significant dependence of spectral index on apparent intensity 1–3. It is therefore of interest to determine the way in which ...

Before lift-off The NIRSpec instrument being tested on the ground prior to the launch of the JWST.(Courtesy:NASA/Chris Gunn) The NIRSpec instrument on the James Webb Space Telescope (JWST) has ...

Scientists know very little about the mysterious force dubbed “Dark Energy” that seems to be quickening the expansion of the universe but, according to LSU Physics and Astronomy Associate Professor ...

More than 90 years ago, astronomer Edwin Hubble observed the first hint of the rate at which the universe expands, called the Hubble constant. More than 90 years ago, astronomer Edwin Hubble observed ...

Doing away with complex calculations? (CC-BY-2.0/Boaz Arad) The next time you need to quickly convert the redshift of some distant cosmic object to parsecs or kilometres, and find that your laptop and ...