We have just seen the first image of a black hole, the supermassive black hole in the galaxy M87 with a mass 6.5 billion times that of our sun. But what is that image really showing us? This is an awesome paper on the topic by J.P. Luminet: Image of a spherical black hole with thin accretion disk Astronomy and Astrophysics, vol. 75, no. 1-2, May 1979, p. 228-235 https://ve42.co/luminet Continue reading
Black holes have been mysterious and elusive — until now. Astronomers using the Event Horizon Telescope (EHT) have, for the first time, photographed one. Continue reading
More people have food allergies than ever before. Peanuts, tree nuts, shellfish, eggs, and even milk… the list of possibly dangerous foods seems to get longer every day. But why do some people’s bodies have deadly reactions food? Continue reading
Canadian astronaut David Saint-Jacques is taking his first spacewalk this morning. Saint-Jacques and U.S. astronaut Anne McClain tackled battery and cable work outside the International Space Station on Monday. It was the third spacewalk in just 2½ weeks for the space station crew. Today’s walk is expected to last 6½ hours. Continue reading
Marshmallows are a tasty, fluffy staple of summertime s’mores, campouts, and backyard barbecues. There really isn’t very much to them, either. The scientific way to see what really fills a marshmallow is to put it to the Marshmallow Masher test. You use a property of air to demonstrate what’s really on the inside of those roasted ‘mallows you make around a campfire. It’s not all sugar.
A leaked copy of a government report on climate change says that since 1948, Canada’s annual average temperature over land has warmed 1.7 C, with higher rates seen in the North, the Prairies and northern British Columbia.