Smithsonian Astrophysical Observatory

A fast radio burst at redshift 2, three billion years after the Big Bang

Fast radio bursts (FRBs) are millisecond-duration radio transients from extragalactic sources. Their frequency and polarization properties are affected by plasma and magnetic fields along the line of sight to Earth. We report radio observations of FRB 20240304B and near-infrared...

The Impact of College Coursework, Out-Of-School Time Activities, and Teaching Experiences on Preservice Teachers’ Scientific Subject Matter Knowledge and Knowledge of Student Misconceptions

This study examined how college-level factors, including general education coursework, STEM courses, out-of-school time (OST) activities, and teaching experiences relate to preservice teachers’ scientific Subject Matter Knowledge (SMK) and Knowledge of Student Misconceptions (KOS...