SCIENCE
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Ask Ethan: Why do gravitational lenses make crosses, not rings?
Gravitational lenses arise when foreground masses and background light sources properly align. Einstein rings are rare, but crosses abound. Continue…
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New JWST lens survey: can it save the expanding Universe?
The VENUS survey isn’t about planets at all, but about finding multiply lensed supernovae. The ambition? To save the expanding…
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Starts With A Bang podcast #125 — Large-scale structure
The seeds of cosmic structure that were planted back during the Big Bang grew into the cosmic web we see…
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Zeno’s Paradox resolved by physics, not by math alone
Travel half the distance to your destination, and there’s always another half to go. So how do you eventually arrive?…
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What does oxygen in JWST’s most distant galaxies really mean?
In a galaxy less than 300 million years after the Big Bang, oxygen’s presence abounds. That’s expected; its absence would…
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Ask Ethan: Why is there no such thing as antigravity?
In general relativity, matter and energy curve spacetime, which we experience as gravity. Why can’t there be an “antigravity” force?…
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Prove Einstein’s relativity for yourself for under $100
Particles are everywhere, including particles from space that stream through the human body. Here’s how they prove Einstein’s relativity. Continue…
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Ask Ethan: Why does something exist instead of nothing?
Perhaps the most remarkable fact about the Universe is simply that it, and everything in it, exists. But what’s the…
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Why ice skating is a miracle of physics
While ice itself is slick, slippery, and difficult to navigate across under most circumstances, skaters easily glide across the ice.…
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Ask Ethan: Can stars form within the expanding Universe?
Our Universe doesn’t just expand and cool, but the expansion itself is accelerating. Can stars form under such structure-erasing… Continue…
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