What happens to a light inside a sphere with 100% albedo? Our science experts discuss the results of this theoretical question.
Physics, Archimedes’ Principle, helium balloons, and air as a liquid – Dr. Paul Heckert answers a reader question in this new Ask the Expert article.
The Helium shortage one year later; what happened over the last 12 months? Qatar increased production and there’s a new Liquid Helium Purchasing Program.
Rainbows have everything to do with how light is reflected and refracted inside raindrops. Alexander’s band has nothing to do with rag time.
What are the mysterious x-ray emissions coming from galaxy clusters? Could researchers have found signals coming from dark matter?
Experiments have shown how to convert matter into light, but reversing the process isn’t quite as simple. There’s a new theory to solve the puzzle.
Researchers have found direct evidence of Cosmic Inflation, a theory that suggests ripples in the fabric of spacetime produced an enormous hyper-expansion of space after the Big Bang.