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The First Stars in the Universe

Exceptionally massive and bright, the earliest stars changed the course of Cosmic history

By Richard B. Larson and Volker Bromm

The Life Cycle of Galaxies

Astronomers are on the verge of explaining the enigmatic variety of galaxies

By Frank van den Bosch and Guinevere Kauffmann

Cosmological Antigravity

The Long-Derided Cosmological Constant-a Contrivance of Albert Einstein's-- may explain changes in the expansion rate of the universe

By Lawrence M. Krauss

The Quintessential Universe

The universe has recently been commandeered by an invisible energy field, which is causing its expansion to accelerate outward Is it all over but the shouting?

By Jeremiah P. Ostriker and Paul J. Steinhardt

Is Space Finite?

Conventional wisdom says the universe is infinite. But it could be finite, merely giving the illusion of infinity

By Glenn D. Starkman, Jean-Pierre Luminet and Jeffrey R. Weeks

The Universe's Unseen Dimensions

The visible universe could lie on a membrane floating within a higher-dimensional space

By Georgi Dvali, Nima Arkani-Hamed and Savas Dimopoulos

A Cosmic Cartographer

The Microwave Anisotropy Probe will give cosmologists a much sharper picture of the early universe

By Charles L. Bennett, Gary F. Hinshaw and Lyman Page

Echoes from the Big Bang

Scientists may soon glimpse the universe's beginnings by studying the subtle ripples made by gravitational waves

By Marc Kamionkowski and Robert R. Caldwell

Exploring Our Universe and Others

This Century cosmologists will unravel the mystery of our universe's Birth-and perhaps prove the existence of other universes as well

By Martin Rees

Ripples in Spacetime

Physicists have spent eight years and 365 million building a radically new kind of observatory to detect gravitational waves. but will it work? a trial run put it to the test

By W. Wayt Gibbs

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