Ethan SiegelinStarts With A Bang!The Universe’s “dark ages” were briefer than we imaginedThere was a time where no starlight was visible throughout the entire cosmos. That time was short-lived: shorter than astronomers imagined.8h ago8h ago
Ethan SiegelinStarts With A Bang!Ask Ethan: Could gravitational waves collapse into a black hole?Gravitational waves carry enormous amounts of energy, but spread out quickly once they leave the source. Could they ever create black…3d ago33d ago3
Ethan SiegelinStarts With A Bang!How traveling back in time is permitted by Einstein’s physicsTraveling back in time is a staple of science fiction movies. But according to Einstein, it’s a physical possibility that’s truly allowed.4d ago114d ago11
Ethan SiegelinStarts With A Bang!Astronomy’s secret weapon in the resolution wars: interferometryThe sharpest optical images, for now, come from the Hubble Space Telescope. A ground-based technique can make images over 100 times…5d ago15d ago1
Ethan SiegelinStarts With A Bang!The one reason that physicists won’t give up on supersymmetryAlmost 100 years ago, an asymmetric pathology led Dirac to postulate the positron. A similar pathology could lead us to supersymmetry.6d ago106d ago10
Ethan SiegelinStarts With A Bang!7 bizarre facts about the Solar System to stump any scientistFrom the coldest planets to spacecraft that have exited the Solar System, these little-known facts stump even many professional…Jun 245Jun 245
Ethan SiegelinStarts With A Bang!Ask Ethan: Is the Universe finite or infinite?The Universe’s history, from cosmic inflation to the Big Bang to the present, is known. But whether it’s infinite or not is still a…Jun 2111Jun 2111
Ethan SiegelinStarts With A Bang!After 13.8 billion years, why hasn’t the Big Bang faded away?Although the Big Bang occurred at an instant in time long ago, we still see the light from it. Will the evidence ever disappear completely?Jun 206Jun 206
Ethan SiegelinStarts With A Bang!The Milky Way’s stars are gradually being ejectedKnown as hypervelocity stars, we originally thought just one would be ejected every 100,000 years. The real number is much greater.Jun 197Jun 197
Ethan SiegelinStarts With A Bang!Astronomers near a complete picture for how planets formNewborn stars are surrounded only by a featureless disk. Debris disks persist for hundreds of millions of years. So when do planets form?Jun 184Jun 184