(Top panel) Fit to Doppler parameter distribution and Lyman-alpha forest column density distribution function at z=0.1 assuming a maximum contribution of dark photon heating to linewidths. The contours show the projection of the 68% and 95% intervals for the mass and the mixing parameter of the dark photon. Colors correspond to different assumptions about the …
The amount of oxygen in Earth’s atmosphere makes it a habitable planet. Twenty-one percent of the atmosphere is made up of this life-giving element. But in the distant past – as far back as the Neoarchean era 2.8 to 2.5 billion years ago – this oxygen was almost absent. So how did the Earth’s atmosphere …
Where does Earth’s oxygen come from? A new study hints at an unexpected source Read More »
When the New Horizons probe reached the outer darkness of the solar system, past Pluto, its instruments picked up something strange. Very, very dimly, the space between the stars shone with optical light. This was not in itself unexpected; this light is called the cosmic optical background, a faint luminescence from all light sources in …
An Unexpected Source Could Help The Universe Shine Brighter Than It Should Read More »
The amount of oxygen in Earth’s atmosphere makes it a habitable planet. Twenty-one percent of the atmosphere is made up of this life-giving element. But in the distant past – as early as the Neoarchean era 2.8-2.5 billion years ago – this oxygen was almost absent. So how did the Earth’s atmosphere get oxygenated? Our …
Earth’s oxygen comes from a surprisingly deep and warm source, study finds Read More »
