Dark energy flips its sign, but the Hubble tension refuses to budge

by Sehjal Khandelwal, Abraão J. S. Capistrano and Suresh Kumar

Dark energy flips its sign, but the Hubble tension refuses to budge
Visualization of cosmic expansion: From the Big Bang through the sign-switching point to modern accelerated growth. Credit: Gemini

For nearly a century, astronomers have known that the universe is expanding. In the late 1990s, two independent teams, the Supernova Cosmology Project, led by Saul Perlmutter, and the High-Z Supernova Search Team, led by Brian Schmidt and Adam Riess, discovered something strange: The expansion is speeding up. The finding earned them the 2011 Nobel Prize in Physics. The leading explanation for this acceleration is "dark energy," a mysterious force usually modeled as a constant called Lambda, pushing space apart. Combined with cold dark matter, this gives us the LCDM model, the standard picture of the cosmos for the past 25 years.

Apple calls OpenAI's hardware business 'rotten to its core' in trade secret theft lawsuit - Engadget

The lawsuit also names io Products, the hardware company led by Jony Ive.

Erman Gunes/Shutterstock

Apple is suing OpenAI and two of its former employees who currently work at the AI company, for theft of its trade secrets. In a lawsuit filed in federal court Friday, Apple alleges extensive misconduct by the company it once partnered with, describing its hardware business as "rotten to its core."

Chris Mason on Widdecombe: Pugnacious, charismatic and she always answered the question

You can see it in the facial expressions of our political leaders and hear it in the tenor and tone of their voices.

People across Westminster and beyond are stunned at the news of the murder investigation into the death of Ann Widdecombe. The sadness at the loss of a friend to many, magnified by the horror of what we were to later learn about its horrific circumstances.

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Emily Long

Emily Long

Freelance Writer

Experience

Emily Long is a freelance writer based in Salt Lake City.

After graduating from Duke University, she spent several years reporting on the federal workforce for Government Executive, a publication of Atlantic Media Company, in Washington, D.C. She has nearly a decade of experience as a freelancer covering tech (including issues related to security, privacy, and streaming) as well as personal finance and travel.