kaBOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOM

Blue supergiant superstars go superboom, and take their own sweet time doing it.

http://www.slate.com/blogs/bad_astronomy/2013/04/19/ultralong_gamma_ray_bursts_hours_long_events_caused_by_supergiant_stars.html

Pyongyang, North Korea. A shrouded city of much global concern. In stark contrast with the South, not too far away.

The mighty St. Lawrence river and a massive impact crater... FROM SPACE!

http://www.slate.com/blogs/bad_astronomy/2013/04/21/impact_crater_astronaut_photo_of_the_manicouagan_crater_in_quebec.html

Astronaut Chris Hadfield tweeted this picture from orbit yesterday, showing Canada's St. Lawrence river glowing in the sunlight. But my eye was drawn to the gigantic circular feature to the right: the Manicouagan crater, the 100-km-wide site of an ancient asteroid impact.

#EarthDay   #ScienceSunday   

Mt Etna erupting and shooting steam and smoke high above the cloud, seen from space.