Cosmology

Is There a Mirror World?

Dark particles could explain the puzzling variation of observed values of the Hubble Constant, according to recent research

Logarithmic representation of the observable universe. Notable astronomical objects are annotated. Distance from Earth increases exponentially from center to edge. Celestial bodies were enlarged to appreciate their shapes. Rendered specially for Wikipedia.org by Pablo Carlos Budassi. Image credit: Pablo Carlos Budassi, CC BY-SA 4.0 <https://creativecommons.org/licenses/by-sa/4.0>, via Wikimedia Commons

The Hubble Constant isn’t

What seemed a certainty when I was a physics undergrad has become less certain. The Hubble Constant (H0) is…