A new study led by an international team involving scientists from NCCR PlanetS, the University of Geneva and the University of Bern have demonstrated the existence of two distinguishable populations of sub-Neptunes based
Classical Cepheid variables are a special class of stars that exhibit period variation in their observed brightness. These are typically young population III stars with high masses, usually 3 – 30 solar masses.
In December 2019, researchers at the Zwicky Transient Facility (ZTF) identified unusual nuclear variability in an early-type galaxy, SDSS J133519.91+072807.4.