Ethan SiegelinStarts With A Bang!No matter how you interpret the data, dark energy remainsDark energy is one of the biggest mysteries in all the Universe. Is there any way to avoid “having to live with it?”·11 min read·14 hours ago--10
Ethan SiegelinStarts With A Bang!The better way to measure cosmic timeFor some reason, when we talk about the age of stars, galaxies, and the Universe, we use “years” to measure time. Can we do better?·12 min read·4 days ago--5
Ethan SiegelinStarts With A Bang!The Universe might never run out of hydrogenThe most common element in the Universe, vital for forming new stars, is hydrogen. But there’s a finite amount of it; what if we run out?·10 min read·5 days ago--2--2
The Conversation U.S.inAha!Can We See the Beginning of Time?The most powerful telescopes are like time travel machines, seeing the universe as it once was. The challenge, though, is that there has…·5 min read·Apr 29, 2024--3--3
Ethan SiegelinStarts With A Bang!No matter how you interpret the data, dark energy remainsDark energy is one of the biggest mysteries in all the Universe. Is there any way to avoid “having to live with it?”·11 min read·14 hours ago--10
Ethan SiegelinStarts With A Bang!The better way to measure cosmic timeFor some reason, when we talk about the age of stars, galaxies, and the Universe, we use “years” to measure time. Can we do better?·12 min read·4 days ago--5
Ethan SiegelinStarts With A Bang!The Universe might never run out of hydrogenThe most common element in the Universe, vital for forming new stars, is hydrogen. But there’s a finite amount of it; what if we run out?·10 min read·5 days ago--2
The Conversation U.S.inAha!Can We See the Beginning of Time?The most powerful telescopes are like time travel machines, seeing the universe as it once was. The challenge, though, is that there has…·5 min read·Apr 29, 2024--3
Ethan SiegelinStarts With A Bang!Does light itself truly have an infinite lifetime?In all the Universe, only a few particles are eternally stable. The photon, the quantum of light, has an infinite lifetime. Or does it?·12 min read·Apr 23, 2024--16
Foundation of Astronomical Studies and ExplorationAstronomical Spectroscopy: Fingerprinting the StarsASTROPHYSICS18 min read·1 day ago--
Ethan SiegelinStarts With A Bang!Not a constant: the Hubble “constant” changes over timeThe Universe is expanding, and the Hubble constant tells us how fast. But how can it be a constant if the expansion is accelerating?·11 min read·Apr 24, 2024--2