06/11/2020

Feeding a galaxy's nuclear black hole

A galactic bar is the approximately linear structure of stars and gas that stretches across the inner regions of some galaxies. The bar stretches from one inner spiral arm, across the nuclear region, to an arm on the other ...

Emerald ash borer puts trees on path to functional extinction

Since the emerald ash borer's introduction to the United States at the beginning of the 21st century, forest ecologists and government officials have striven to stem its destruction of ash forests. Despite those efforts, ...

page 3 from 7