Ethan SiegelinStarts With A Bang!Ask Ethan: Why don’t we feel the Universe’s expansion accelerating?The Universe isn’t just expansion, but the expansion itself is accelerating. So why can’t we feel it in any measurable way?4h ago14h ago1
Ethan SiegelinStarts With A Bang!What is the origin of quantum uncertainty?No matter how good our measurement devices get, certain quantum properties always possess an inherent uncertainty. Can we figure out why?1d ago21d ago2
Ethan SiegelinStarts With A Bang!Why haven’t we detected a signal from intelligent aliens yet?Life arose on Earth early on, eventually giving rise to us: intelligent and technologically advanced. “First contact” still remains…2d ago42d ago4
Ethan SiegelinStarts With A Bang!How far away are we from the location of the Big Bang?If you think of the Big Bang as an explosion, we can trace it back to a single point-of-origin. But what if it happened everywhere at once?3d ago23d ago2
Ethan SiegelinStarts With A Bang!Why do we count the Universe’s age from 13.8 billion years ago?The Universe is 13.8 billion years old, going back to the hot Big Bang. But was that truly the beginning, and is that truly its age?4d ago24d ago2
Ethan SiegelinStarts With A Bang!If the Big Bang wasn’t the first thing ever, what caused it?Many contrarians dispute that cosmic inflation occurred. The evidence says otherwise.Aug 237Aug 237
Ethan SiegelinStarts With A Bang!Is it true that photons truly live forever?In all the Universe, only a few particles are eternally stable. The photon, the quantum of light, has an infinite lifetime. Or does it?Aug 2218Aug 2218
Ethan SiegelinStarts With A Bang!The Hubble tension: still unresolved, despite new measurementsThe big question isn’t whether the Universe is expanding at 67 or 73 km/s/Mpc. It’s why different methods yield such different answers.Aug 218Aug 218
Ethan SiegelinStarts With A Bang!Relativity: the oldest physics principle that’s still correctThe original principle of relativity, proposed by Galileo way back in the early 1600s, remains true in its unchanged form even today.Aug 208Aug 208
Ethan SiegelinStarts With A Bang!Our cosmic home is typical for stars, but not for galaxiesMost stars in the Universe are located in big, massive, Milky Way-like galaxies. But most galaxies aren’t like ours at all.Aug 196Aug 196