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How fast is the Universe expanding? Two major methods disagree. New JWST data, just released, strengthens this Hubble tension even further.

Astronomers used galaxy clusters as a way to probe the existence of the mysterious force called "dark energy" throughout space and time.

Some say the world will end in fire, Some say in ice. From what I've tasted of desire I hold with those who favor fire. But if it had to perish twice, I think I know enough of hate To say that for destruction ice Is also great And would suffice. -Robert Frost Sure, if all we're talking about is the Earth, that one's a no-brainer. It's fire.

As always, I'm happy to bring you the best of the comments from this past week, and know that starting  next week, I'll be going back two weeks rather than the standard one in order to make sure that any follow-up comments that need attention get exactly what they deserve. That said, let's jump on in to your Comments of the Week! From James Carlson on the Big Rip scenario: "It could be that entropy doesn’t play to a full house in that the big rip might serve to recreate the universe in a sudden expansion of spacetime and the creation of sub atomic oaricles."

The Hobby-Eberly Telescope.Image: Marty Harris, McDonald Observatory, UT Austin The universe we see is only the very tip of the vast cosmic iceberg. The hundreds of billions of galaxies it contains, each of them home to billions of stars, planets and moons as well as massive star-and-planet-forming clouds of gas and dust, and all of the visible light and other energy we can detect in the form of electromagnetic radiation, such as radio waves, gamma rays and X-rays – in short, everything we’ve ever seen with our telescopes – only amounts to about 5% of all the mass and energy in the univ...