Based on the precise measurements reported in this study, researchers hypothesized what mixtures of bulk ingredients could give the TRAPPIST-1 planets their densities, offering the most precise picture of exoplanet composition achieved to date.
With the third week of winter quarter underway at the University of California San Diego, COVID-19 case rates have fallen dramatically since classes resumed on Jan. 4. The current test positivity rate on campus has reduced to pre-break levels of less than 1%.