What happens to a light inside a sphere with 100% albedo? Our science experts discuss the results of this theoretical question.
Can Adjusting the Amount of Helium in a Balloon Affect Its Height?
Physics, Archimedes’ Principle, helium balloons, and air as a liquid – Dr. Paul Heckert answers a reader question in this new Ask the Expert article.
Helium Shortage: Update After One Year
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.
Rainbow, Double Rainbow, And Alexander’s (Dark) Band
Rainbows have everything to do with how light is reflected and refracted inside raindrops. Alexander’s band has nothing to do with rag time.
Mysterious Emission from Galaxy Clusters: Is it Dark Matter?
What are the mysterious x-ray emissions coming from galaxy clusters? Could researchers have found signals coming from dark matter?
Proposed Experiment to Convert Light into Matter in Simplest Way Known
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.
Antarctica Telescope Finds Direct Evidence for Cosmic Inflation
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.
