Quantum Physics
String Theory May Create Far Fewer Universes Than Thought
Some physicists claim that the popular landscape of universes in string theory may not exist
Features
Space & Physics
Should the Moon Be Quarantined?
Nearly a half century after astronauts first visited the moon, it is once again a flash point for debates on how to safely, responsibly explore the solar system
Space & Physics
Is Gravity Quantum?
The ongoing search for the graviton—the proposed fundamental particle carrying gravitational force—is a crucial step in physicists’ long journey toward a theory of everything...
Departments
Astroethics and Cosmocentrism
- From the Editor
Problems with the Multiverse
- News
Deep within Mars, Liquid Water Offers Hope for Life
Did a Stellar Intruder Deform Our Outer Solar System?
Neutrinos on Ice: Astronomers' Long Hunt for Source of Extragalactic "Ghost Particles" Pays Off
Milky Way's Black Hole Provides Long-Sought Test of Einstein's General Relativity
A Superconductor Scandal? Scientists Question a Nobel Prize–Worthy Claim
- Sky Report
Celestial Movement
- Opinion
Theoretical Physics Is Pointless without Experimental Tests
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