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The Search for Extraterrestrial Life

The earth remains the only inhabited world known so far, but scientists are finding that the universe abounds with the chemistry of life

By Carl Sagan

Life in the Universe

We comprehend the universe and our place in it. But there are limits to what we can explain at present. Will research at the boundaries of science reveal a special role for intelligent life?

By Steven Weinberg

The Evolution of the Universe

Some 15 billion years ago the universe emerged from a hot, dense sea of matter and energy. As the cosmos expanded and cooled, it spawned galaxies, stars, planets and life

By P. James E. Peebles, David N. Schramm, Edwin L. Turner and Richard G. Kron

The Earth's Elements

The elements that make up the earth and its inhabitants were created by earlier generations of stars

By Robert P. Kirshner

The Evolution of the Earth

The formation of this planet and its atmosphere gave rise to life, which shaped the earth's subsequent development. Our future lies in interpreting this geologic past

By Claude J. Allgre and Stephen H. Schneider

The Origin of Life on the Earth

Growing evidence supports the idea that the emergence of catalytic RNA was a crucial early step. How that RNA came into being remains unknown

By Leslie E. Orgel

The Evolution of Life on the Earth

The history of life is not necessarily progressive;it is certainly not predictable. The earth's creatures have evolved through a series of contingent and fortuitous events

By Stephen Jay Gould

Sustaining Life on the Earth

Hope for an environmentally sustainable future lies in evolving institutions technology and global concern

By Robert W. Kates


  • The Emergence of Intelligence

  • Will Robots Inherit the Earth?

  • Book Reviews--Flows and Floods

  • Letters


  • Letters to the Editors, October 1994

  • 50, 100 & 150 Years Ago

    50 and 100 Years Ago: Penicillin Production and Life on Mars?

  • Profile

    Unearthing History

  • Amateur Scientist

    Building an Electronic Neuron

  • Science and the Citizen

    By Jove!

  • Standing Tall

  • A Healthy Mess

  • What's in a Name?

  • Fishy Repair Jobs

  • Daydreaming

  • High Profile

  • Departments

    Descartes' Error and the Future of Human Life

  • Technology and Business

    Wall Street

  • Ready or Not

  • OpenDoc

  • Making Drugs Count

  • State of Shock

  • Is a Bright Idea Flickering?

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October 1994

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