Two lobes emanating from the galactic plane may have been created when the supermassive black hole at the center of the galaxy was more active than it is today.
In the 30 years since the ozone hole was discovered, our understanding of the polar atmosphere has become much more complete. The worldwide response to the discovery was fast, but the recovery is slow.
The universally accepted method of expressing physical measurements for world commerce, industry, and science is about to get a facelift, thanks to our improved knowledge of fundamental constants.
High-power radio and microwave beams join cost-effective, solid-state lasers on US military’s horizon.