Quantum Physics
This Twist on Schrödinger's Cat Paradox Has Major Implications for Quantum Theory
A laboratory demonstration of the classic “Wigner’s friend” thought experiment could overturn cherished assumptions about reality
Features
Space & Physics
How Many Aliens Are in the Milky Way? Astronomers Turn to Statistics for Answers
The tenets of Thomas Bayes, an 18th-century statistician and minister, underpin the latest estimates of the prevalence of extraterrestrial life
Space & Physics
NASA Has Launched the Most Ambitious Mars Rover Ever Built: Here's What Happens Next
Perseverance will stow away rocks for eventual delivery to Earth and will listen for Martian sounds for the first time
Departments
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From the Editor
The Most Confused of the Scientific Branches
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News
Quantum Tunneling Is Not Instantaneous, Physicists Show
Scientists Unveil First Ever Pictures of Multiple Planets around a Sunlike Star
Time's Arrow Flies through 500 Years of Classical Music, Physicists Say
Higgs Boson Gives Next-Generation Particle Its Heft
Mystery over Universe's Expansion Deepens with Fresh Data
This Photo of the Sun Is the Closest Ever Taken
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Opinion
'Unidentified Aerial Phenomena,' Better Known as UFOs, Deserve Scientific Investigation
Could We Force the Universe to Crash?
A Movie of the Evolving Universe Is Potentially Scary
