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Category Archives: Astrophysics
How did the universe begin?
In this video I go through the different theories which physicists have for how the universe began. To learn more about inflation and the inflaton field, this is an excellent starting point: https://arxiv.org/abs/0907.5424 Here is more about the Ekpyrotic Universe: … Continue reading
Astronomers Get Their Wish, and the Hubble Crisis Gets Worse
Natalie Wolchover Senior Writer/Editor The Gaia telescope gauges the distances to stars by measuring their parallax, or apparent shift over the course of a year. Closer stars have a larger parallax. We don’t know why the universe appears to … Continue reading
Julian Barbour on “The Janus Point: A New Theory of Time” | Closer To Truth Chats
Physicist Julian Barbour discusses his newest book, “The Janus Point: A New Theory of Time.” In it, Barbour makes the radical argument that the growth of order drives the passage of time — and shapes the destiny of the universe. … Continue reading
Did All Of Our Water Come From? | Answers With Joe
Water covers 71% of the Earth’s surface. We are a water planet, it makes life possible. But where exactly it came from is still a bit of a mystery. Some new studies have shared some light on this question, and … Continue reading
A cyclical, forgetful Universe – Nobel prizewinner Roger Penrose details an astonishing origin hypothesis | Aeon
Since the discovery of cosmic microwave background radiation in 1965, the Big Bang theory has been the dominant model of our Universe’s origin. In the ensuing decades, an obvious and yet still deeply unsettled question has emerged at the core … Continue reading
What Would We Experience If Earth Spontaneously Turned Into A Black Hole?
If a black hole were to appear between the Earth and an observer, the Earth would appear gravitationally lensed in a fashion similar to this, dependent on the Earth’s position relative to the black hole and the observer. If a … Continue reading
Gravity is NOT a Force
The General Theory of Relativity tells us gravity is not a force, gravitational fields don’t exist. Objects tend to move on straight paths through curved spacetime. Thanks to Caséta by Lutron for sponsoring this video. Find out more at: https://www.lutron.com/veritasium … Continue reading
Reinhard Genzel: “Completely unexpected and, wow, I’m on cloud 17.”
In keeping with the times, Reinhard Genzel was in the middle of a virtual conference when he was surprised by the call announcing, “This is Stockholm!” In this interview with Adam Smith he briefly summarises his 40 year effort to … Continue reading
Andrea Ghez: “It amazes me every time I go to the telescope”
“It’s a passion for the universe!” That’s how Andrea Ghez succinctly sums-up her motivation for becoming an astrophysicist in this conversation recorded with Adam Smith shortly after she heard the news of her Nobel Prize in a 2am call from … Continue reading
Roger Penrose: “I had this strange feeling of elation”
In this phone interview with Adam Smith, recorded just after the announcement of the 2020 Nobel Prize in Physics, Roger Penrose recounts the story of how a particular crossroads held the key to his seminal 1965 paper on the theoretical … Continue reading
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