Venus: November 2020

Terrestrial exoplanets orbiting within or near their host stars' habitable zone are potentially apt for life. It has been proposed that time-series measurements of reflected starlight from such planets will reveal their rotational period, main surface features and some atmospheric information.

We first respond to two points raised by Villanueva et al. We show the JCMT discovery spectrum of PH3 can not be re-attributed to SO2, as the line width is larger than observed for SO2 features, and the required abundance would be an extreme outlier.

On 13 November Moa Persson, Swedish Institute of Space Physics (IRF) and UmeƄ University, will defend her doctoral thesis. Her thesis shows that only a small part of the historical water content on Venus has been lost to space over the past 4 billion years. This is much less than researchers previously thought.