The Unapologetic Vatican in the Shapley SuperclusterIn 1992, the Vatican admitted that Galileo Galilei was right and the Earth is not at the center of the Universe. This was a bit late, 350…12h ago12h ago
Dark Comets Might be SpacecraftWhat was the origin of the non-gravitational acceleration of the first recognized interstellar object `Oumuamua? The decline of the force…2d agoA response icon52d agoA response icon5
Happy 75th Anniversary to the National Science Foundation!The National Science Foundation (NSF) was established by the U.S. Congress on May 10, 1950, exactly 75 years and one month ago, with the…3d agoA response icon13d agoA response icon1
Why is the Sky Dark at Night?The Universe is full of radiation, so why is the sky dark at night?3d agoA response icon23d agoA response icon2
Cosmic Rule-of-ThumbIf we chose to shovel matter along a straight line through the observable Universe, what is the average mass of matter per unit area that…5d agoA response icon25d agoA response icon2
Do the Plumes of Europa Carry Frozen Bacteria?Europa is a moon of Jupiter with a quarter of the Earth’s radius, 13.4% of the Earth’s surface gravity, a thin oxygen atmosphere, a third…Jun 7A response icon5Jun 7A response icon5
American Fund for Fundamental ScienceOn June 4, 2025, I attended an inspiring evening discussion in New York City, coordinated by the brilliant Rolf Dobelli, founder of…Jun 6A response icon6Jun 6A response icon6
Attacks on the Three Facets of My IdentityMy identity has three facets. First, I was born on a farm in Israel 63 years ago. Second, I had been an active scientist for forty years…Jun 4A response icon32Jun 4A response icon32
The Pleasure of Being a ScientistIn a recent interview, I was presented with a hypothetical dilemma of choosing between only two options: communicate science or do science…Jun 3A response icon5Jun 3A response icon5
Would We Notice a Nuclear War on an Exoplanet?Imagine a distant Earth-twin exoplanet on which a global nuclear war erupts. How far can we detect the explosions associated with this…Jun 2A response icon11Jun 2A response icon11
