Interesting Engineering21h
20 million years to become a star: Cosmic clock unlocks mystery of sun’s birth time
By studying decay of bound-state beta decay of thallium-205 (205Tl81+), scientists can better understand the timing and ...
Scientific American21h
The Arecibo Message, Earth’s First Interstellar Transmission, Turns 50
The Arecibo Message as it appears when its 1,679 bits are properly aligned on a grid (left), an annotated illustration ...