How to Understand the Image of a Black Hole – YouTube

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

Canadian astronaut David Saint-Jacques takes 1st spacewalk – CBC News

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

Marshmallow Masher | Science Experiments | Steve Spangler Science

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.

Source: Marshmallow Masher | Science Experiments | Steve Spangler Science

Canada warming at twice the global rate, leaked report finds | CBC News

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.

Source: Canada warming at twice the global rate, leaked report finds | CBC News