First successful test of Einstein’s General Relativity Theory near supermassive black hole

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.”

NASA’s Curiosity Rover “spots clouds shaped by gravity waves”

From this story on

“NASA’s Curiosity rover usually keeps its instruments firmly focused on Mars’s ground, zapping grit with its laser or drilling cores in bedrock. But every few days, the SUV-sized robot, like any good dreamer, shifts its sights upward to the clouds. Well into its fifth year, the rover has now shot more than 500 movies of the clouds above it, including the first ground-based view of martian clouds shaped by gravity waves ...”

(See the story for more information, and some animations which unfortunately just keep endlessly repeating.)

How to center elements in an Android LinearLayout (horizontally)

I was just working on centering some components in an Android LinearLayout and came upon this helpful advice:

android:gravity takes care of its children,
android:layout_gravity takes care of itself

So, in my case, where I wanted to center two buttons horizontally in a LinearLayout, I used android:gravity="center".