Distances to stars are huge. That should not surprise us. Space is big. Unbelievably big. How do we know the distances between our sun (a star) and those other stars in the night sky?Continue reading “How Far is ‘Far’ When it Comes to Stars?”
Since the 1960s, the United States government has been shooting lasers at the moon. No, this is not a covert government conspiracy or a relic of the Cold War. It is NASA’s attempt to prove Einstein’s theories right.
Let me explain.
How do you study light from the beginning of the universe? What happened right after the Big Bang? Continue reading “Spotted from Antarctica: the Oldest Light in the Universe”
In 1915, Albert Einstein proposed one of his most revolutionary ideas, the Theory of General Relativity. Continue reading “LIGO Researchers detect Gravitational Waves from Black Hole Collision”