Ytterbium atomic clock could open a new window on fundamental physics

Drawing together leading experts from across the field, an international collaboration of cosmologists has created a unified approach for measuring the value of the Hubble constant. Published in Astronomy & Astrophysics, the milestone could bring us a step closer to understanding why the universe appears to be expanding faster than our standard cosmological model predicts.

Weekends on the International Space Station are for housecleaning and haircuts. NASA astronaut Jessica Meir trims the hair of fellow NASA astronaut Jack Hathaway, both Expedition 74 flight engineers, using an electric razor attached to a vacuum that collects loose clippings to keep the station’s atmosphere clean in microgravity.

Khirigsuurs are Late Bronze Age monuments found across Mongolia and parts of southern Siberia. They are typically thought to be burial monuments or ritual spaces, consisting of a burial mound surrounded by satellite features beneath which horse and caprine (goat/sheep) remains were deposited.