Avi LoebTightening the Upper Limit on the Graviton MassIn Einstein’s General Relativity, gravitational interactions are mediated by a massless particle, the graviton. However, there is a general…1d ago31d ago3
Avi LoebElon Musk: Should Phobos Serve as the Entry Port of SpaceX to Mars?Phobos is the innermost, larger moon of the two satellites of Mars. Phobos orbits Mars every 7 hours, 39 minutes and 12 seconds. With a…4d ago144d ago14
Avi LoebOn Science and ReligionThe sincerest expression of love is the desire to know everything about the subject of that love. I love nature. This is why, as a…5d ago105d ago10
Avi LoebAppreciating the Diversity of Cosmic MessengersHistorically, astronomy started by observing light from sources in the sky. The reason is simple.Oct 273Oct 273
Avi LoebBrian Cox Takes Our Cosmic Status Too SeriouslyIn a new Joe Rogan podcast, the British physicist Brian Cox argued that we hold a great responsibility for prolonging our civilization…Oct 2515Oct 2515
Avi LoebAre Wormholes Real?In 1935, Albert Einstein and His postdoc Nathan Rosen found a hypothical mathematical spacetime structure that bridges between two separate…Oct 2411Oct 2411
Avi LoebPostcard from Interstellar Space: Separating the Wheat from the ChaffThere are hundreds of billions of stars in the Milky-Way galaxy and a substantial fraction of them host a habitable Earth-like planet. Most…Oct 227Oct 227
Avi LoebWhy Are Early Black Holes Over-Massive?Most galaxies host a massive black hole at their center. Think of the gravitational potential well of the host galaxy as a bathroom sink…Oct 203Oct 203
Avi LoebCelebrating Galileo’s Blend of Art and ScienceArt expresses our mental picture of reality through subjective intuitive tools. Science does the same with objective quantitative tools…Oct 194Oct 194
Avi LoebDoes the Sun Host a Black Hole at Its Center?In 1971, Stephen Hawking suggested that a mini black hole from the early universe could be lurking at the center of the sun. His proposal…Oct 1817Oct 1817