light
Astronomy Cast Ep. 369: The Fizeau Experiment
Light is tricky stuff, and it took scientists hundreds of years to puzzle out what this stuff is. But they…
How Far Back Are We Looking in Time?
When we look out into space, we're also looking back into time. Just how far back can we see? The…
Astronomy Cast Ep. 368: Searching for the Aether Wind: the Michelson–Morley Experiment
Waves move through a medium, like water or air. So it seemed logical to search for a medium that light…
What Will We Never See?
Thanks to our powerful telescopes, there are so many places in the Universe we can see. But there are places…
Why Is Space Black?
Since there are stars and galaxies in all directions, why is space black? Shouldn't there be a star in every…
How are Energy and Matter the Same?
As Einstein showed us, light and matter and just aspects of the same thing. Matter is just frozen light. And…
Are All the Stars Really Dead?
Have you ever heard that meme, "When looking at stars, you're actually looking into the past. Many of the stars…
Does Light Experience Time?
Have you ever noticed that time flies when you're having fun? Well, not for light. In fact, photons don't experience…
Can Light Orbit A Black Hole?
Since black holes are the most powerful gravitational spots in the entire Universe, can they distort light so much that…
Astronomy Cast Ep. 335: Photoelectric Effect
Pop quiz. How did Einstein win his Nobel prize? Was it for relativity? Nope, Einstein won the Nobel Prize in…