The northern lights are coming to several states this week. Here's how to see them This week's geomagnetic storm will bring the aurora borealis further south. The Space Weather Prediction Center says the best time to view the aurora borealis is between 10 p.m. and 2 a.m. local time. Ayana Archie
The world is officially 'free' of chemical weapons. Here's what that means The U.S. has destroyed the last of its stockpile of sarin nerve agent, fulfilling a decades-old obligation. Geoff Brumfiel
Years before implosion, experts warned OceanGate CEO and federal government about submersible's dangers Hans Anderson
Researchers found a rare octopus nursery off the coast of Costa Rica It's only the world's third known octopus nursery. The research team may have also discovered a new species of Muusoctopus, a genus of small to medium sized octopus that lacks an ink sack. Joe Hernandez
This week in science: gravitational waves, nature-inspired robots and Orca attacks Hosts of NPR's science podcast Short Wave talk about newly-discovered gravitational waves, a robot designed with inspiration from nature and why Orcas might be attacking boats near the European coast. Regina G. Barber
Our own Milky Way is sending out neutrinos, the so-called 'ghost particles' Scientists have detected these strange particles from outer space before, but this is the first time they've caught cosmic neutrinos from our own Milky Way Nell Greenfieldboyce
Scientists have found signs of a new kind of gravitational wave. It's really big Scientists say they've found evidence of a very long gravitational wave that could open a window onto supermassive black holes — and perhaps even other extreme, unseen objects in the universe. Nell Greenfieldboyce
For amateur astronomers, 'star parties' are the antidote to light-polluted skies Each year in northern Pennsylvania, hundreds of stargazers attend gatherings under increasingly rare dark skies to look for faint galaxies, star clusters and nebulae. Scott Neuman
Here's the latest on the missing Titanic sub and the race to rescue those inside The Titan, a minivan-sized submersible, was carrying five people to the Titanic's watery grave when it lost contact. Rescuers are expanding underwater efforts, a sign the vessel may be snagged. Emily Olson
A search is underway for a missing submersible that brings tourists to the Titanic A submersible capable of taking tourists over 2 miles underwater to view the Titanic wreckage up close has gone missing. Juliana Kim
