By looking ever further back in time, the James Webb Space Telescope is at last revealing the first galaxies – and a very ...

Redshift occurs because older stars end up farther away as the universe continues to expand. Red is also the longest wavelength in the visible light spectrum, so faraway stars look redder since ...

That star existed when the universe was about 4 billion years old, or 30 percent of its current age, at a time astronomers refer to as a “1.5 redshift”. Scientists use the term “redshift ...

This indicated the stars were moving away from Earth (just ... this phenomenon was termed 'redshift'. Figure caption, Lower diagram shows spectrum of light redshifted from a distant galaxy moving ...

which suggests an onset of quenching of star-formation. The astronomers suppose that these galaxies would become about two times more massive and would enter a quiescent phase at a redshift of ...

I work on theories of galaxy formation, reionization, first stars, primordial metal production, and numerical hydrodynamical simulations of high-redshift galaxies and the multi-phase intergalactic ...