Why was it so hard to take a picture of a black hole? alvin April 16, 2019 - 9:07am has a good answer to, Why was it so hard to take a picture of a black hole?

How and why Japan exploded a small bomb on an asteroid alvin April 8, 2019 - 10:32am has an interesting story about how and why Japan exploded a small bomb on an asteroid.

Purdue University 2018 engineering gift guide alvin November 29, 2018 - 7:44am

From their website: “The 2018 Engineering Gift Guide from Purdue University is filled with fun toys, games, books, and applications to engage girls and boys ages 3-18 in engineering thinking and design. Researchers looked for toys that would promote engineering practices ranging from coding and spatial reasoning to problem solving and critical thinking.”

A mile-wide meteor hit Greenland and was hidden by an ice sheet

The most interesting story for me yesterday was that a mile-wide meteor hit Greenland, possibly as recent as 12,000 years ago, and created an impact crater 19.3 miles wide. The impact would have released 47,000 times the amount of energy that was released by the Little Boy nuclear bomb that was dropped on Hiroshima in 1945. The impact crater was hidden by a half-mile thick sheet of ice until recently. (The image shown comes from the article I linked to.)

First successful test of Einstein’s General Relativity Theory near supermassive black hole alvin July 28, 2018 - 1:32pm

From “Observations made with ESO’s Very Large Telescope have for the first time revealed the effects predicted by Einstein’s general relativity on the motion of a star passing through the extreme gravitational field near the supermassive black hole in the centre of the Milky Way. This long-sought result represents the climax of a 26-year-long observation campaign using ESO’s telescopes in Chile.”