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Giant Galaxies from the Universe's Childhood Challenge Cosmic Origin Stories
Space

Giant Galaxies from the Universe's Childhood Challenge Cosmic Origin Stories

Large galaxies are thought to form gradually, across billions of years of cosmic time. So why do astronomers keep finding them in the youthful early universe?

By Robin George Andrews
Telescopes on Far Side of the Moon Could Illuminate the Cosmic Dark Ages
Space

Telescopes on Far Side of the Moon Could Illuminate the Cosmic Dark Ages

Instruments deployed on missions to the lunar far side might give us an unprecedented view of the early universe

By Anil Ananthaswamy
Astronomer Avi Loeb Says Aliens Have Visited, and He's Not Kidding
Space

Astronomer Avi Loeb Says Aliens Have Visited, and He's Not Kidding

In conversation, the Harvard University professor explains his shocking hypothesis—and calls out what he sees as a crisis in science

By Lee Billings

Departments

  • From the Editor

    Onward, Intrepid Rover

  • News

    Perseverance Has Landed! Mars Rover Begins a New Era of Exploration

  • The First 100 Days on Mars: How NASA's Perseverance Rover Will Begin Its Mission

  • Galaxy-Size Gravitational-Wave Detector Hints at Exotic Physics

  • Is It a Planet? Astronomers Spy Promising Potential World around Alpha Centauri

  • Mystery of Spinning Atomic Fragments Solved at Last

  • Quantum Network Is Step Toward Ultrasecure Internet

  • Opinion

    Until Recently, People Accepted the 'Fact' of Aliens in the Solar System

  • Quantum Mechanics, Free Will and the Game of Life

  • Did a Supermassive Black Hole Influence the Evolution of Life on Earth?

  • Physicists Need to Be More Careful with How They Name Things

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