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Walkabout the Galaxy

Odd Radio Circles

Mar 30, 2022

No, these aren't fake relics of extraterrestrials left in fields of wheat, but they are peculiar signatures of what may be bursts of star formation in distant galaxies. We explore Odd Radio Circles, oxygen on Europa, and the history of Tolkien's Orcs. 

Mar 23, 2022

What if the stuff that makes up most of the stuff in the universe is so lightweight that you could barely call it stuff? Ultralight dark matter is one possible way to explain the puzzle of the very early formation of supermassive black holes. We explore this and the intriguing origins of Ceres, and much more.

Mar 16, 2022

We like to think we understand ordinary matter: the stuff we're familiar with that makes up stars, planets, and donuts. Sure Dark Energy and Dark Matter are mysterious, but the rest we have a handle on. Or do we? The New Horizons mission adds to a growing puzzle about the Cosmic Optical Background, not to be confused...

Mar 9, 2022

Even the emptiness between galaxies is filled with enough energy over those vast expanses to generate shock waves and giant structures when clusters of galaxies collide. We explore this, the lives of galaxies, and some intriguing results about activity on the asteroid Ceres.

Mar 2, 2022

We learn how binary star systems may create a second family of planets, Saturn's aurora may be powered by the ringed planet's high speed winds, and how thinking of planetary intelligence may guide future searches for extraterrestrial life.