This is one of my favorite stories. In short, one of John Burk's (@occam98) students wanted to launch a space balloon. If you want all the details, this post at Quantum Progress pretty much says it ...

Intuitively, we all know that when we see an image of an object, it could either be large and far away or small and close by. Only with a three-dimensional measurement can we actually know what's ...

The angular field of view (often called FOV) is a measure of the angular size for an image produced by a camera. Different cameras have different FOV. But who cares, right? I care. I care because it ...

All three of these astronomical alignments provide astronomers with opportunities to study our solar system and galaxy. And, all three involve shadows! What’s the difference between the three, you ask ...

One of the classic optical illusions involves the Moon, which appears larger near the horizon than overhead. This illusion has been known and discussed for centuries and yet its explanation is still ...

Surprising as it may sound, 107 years after the introduction of general relativity, the meanings of basic concepts are still being worked out. More than a century after Albert Einstein unveiled ...