SCIENCE

Ask Ethan: Could dark energy be more negative than a cosmological constant? | by Ethan Siegel | Starts With A Bang! | May, 2025

For the first several billion years of our Universe’s history, the Universe’s expansion rate was decreasing and distant galaxies slowed…

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The red color of Mars is mere inches deep | by Ethan Siegel | Starts With A Bang! | May, 2025

This sand dune, known as Dingo Gap, was crossed by Mars Curiosity in 2014. This image has been slightly ‘white…

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11 NASA astrophysics missions face risk of cancellation | by Ethan Siegel | Starts With A Bang! | May, 2025

To learn how galaxies grow and evolve over cosmic time, including an understanding of how gas infalls and gets expelled…

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Ask Ethan: Has the USA become a fascist nation in 2025? | by Ethan Siegel | Starts With A Bang! | May, 2025

Fascism isn’t defined by symbols like a strong-arm salute, a red hat, or a cult of personality surrounding a leader.…

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The most “boring” part of cosmic history shaped our modern Universe | by Ethan Siegel | Starts With A Bang! | May, 2025

This illustration shows a series of galaxies distributed throughout space, with many galaxies distributed in a spherical structure that represents…

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Ask Ethan: Is dark energy just leftover momentum from the Big Bang? | by Ethan Siegel | Starts With A Bang! | May, 2025

By mapping out the three-dimensional positions of galaxies over a large volume of the Universe, scientists within the DESI collaboration…

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This 1938 pro-science manifesto defended democracy against fascism | by Ethan Siegel | Starts With A Bang! | May, 2025

In 2019, with Hurricane Dorian bearing down on the Florida coast, the official NOAA predictions (in white) were edited with…

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Ask Ethan: When do stars turn the most mass into energy? | by Ethan Siegel | Starts With A Bang! | May, 2025

This Wolf–Rayet star is known as WR 31a, located about 30,000 light-years away in the constellation of Carina. The outer…

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Why 21 cm is our Universe’s “magic length” | by Ethan Siegel | Starts With A Bang! | May, 2025

This map of the galaxy Messier 81, constructed from data taken with the Very Large Array, maps out this spiral-armed,…

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How come we’ve never observed a black hole decaying? | by Ethan Siegel | Starts With A Bang! | Apr, 2025

A black hole, even in radio wavelengths alone, will exhibit a large number of different features owing to the bending…

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