The Search for Worlds Like Our Own
Artikel i vetenskaplig tidskrift, 2010

The direct detection of Earth-like exoplanets orbiting nearby stars and the characterization of such planets particularly, their evolution, their atmospheres, and their ability to host life-constitute a significant problem. The quest for other worlds as abodes of life has been one of mankind's great questions for several millennia. For instance, as stated by Epicurus similar to 300 BC: "Other worlds, with plants and other living things, some of them similar and some of them different from ours, must exist.'' Demokritos from Abdera (460-370 BC), the man who invented the concept of indivisible small parts-atoms-also held the belief that other worlds exist around the stars and that some of these worlds may be inhabited by life-forms. The idea of the plurality of worlds and of life on them has since been held by scientists like Johannes Kepler and William Herschel, among many others. Here, one must also mention Giordano Bruno. Born in 1548, Bruno studied in France and came into contact with the teachings of Nicolas Copernicus. He wrote the book De l'Infinito, Universo e Mondi in 1584, in which he claimed that the Universe was infinite, that it contained an infinite amount of worlds like Earth, and that these worlds were inhabited by intelligent beings. At the time, this was extremely controversial, and eventually Bruno was arrested by the church and burned at the stake in Rome in 1600, as a heretic, for promoting this and other equally confrontational issues (though it is unclear exactly which idea was the one that ultimately brought him to his end). In all the aforementioned cases, the opinions and results were arrived at through reasoning-not by experiment. We have only recently acquired the technological capability to observe planets orbiting stars other than our Sun; acquisition of this capability has been a remarkable feat of our time. We show in this introduction to the Habitability Primer that mankind is at the dawning of an age when, by way of the scientific method and 21(st)-century technology, we will be able to answer this fascinating controversial issue that has persisted for at least 2500 years.


extra-solar planets






giant planets

Planet-detection methods





nulling interferometer

Terrestrial exoplanets


M. Fridlund


C. Eiroa

Universidad Autonoma de Madrid (UAM)

T. Henning

Max Planck-institutet

T. Herbst

Max Planck-institutet

H. Lammer

Institut fur Weltraumforschung

A. Leger

Université Paris-Sud

René Liseau

Chalmers, Institutionen för radio- och rymdvetenskap, Radioastronomi och astrofysik

F. Paresce

Istituto Nazionale Di Astrofisica, Rome

A. Penny

Royal Observatory

Rutherford Appleton Laboratory

A. Quirrenbach

Landessternwarte Heidelberg

H. Rottgering

Universiteit Leiden

F. Selsis

Université de Bordeaux

G. J. White

Open University

Rutherford Appleton Laboratory

O. Absil

Universite de Liège

Laboratoire d'Astrophysique de Grenoble

D. Defrere

Universite de Liège

C. Hanot

Universite de Liège

D. Stam

Netherlands Institute for Space Research (SRON)

J. Schneider

Observatoire de Paris-Meudon

G. Tinetti

University College London (UCL)

A. Karlsson


P. Gondoin


R. den Hartog


L. D'Arcio


A. M. Stankov


M. Kilter


C. Erd


C. Beichman

Jet Propulsion Laboratory, California Institute of Technology

D. Coulter

Jet Propulsion Laboratory, California Institute of Technology

W. Danchi

NASA Goddard Space Flight Center

M. Devirian

Jet Propulsion Laboratory, California Institute of Technology

K. J. Johnston

US Naval Observatory

P. Lawson

Jet Propulsion Laboratory, California Institute of Technology

O. P. Lay

Jet Propulsion Laboratory, California Institute of Technology

J. Lunine

University of Arizona

L. Kaltenegger

Harvard-Smithsonian Center for Astrophysics


1531-1074 (ISSN)

Vol. 10 1 5-17


Astronomi, astrofysik och kosmologi


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