Butler, R. Paul Department of Terrestrial Magnetism, Carnegie Institution for Science, Washington DC.
Traub, Wesley A. Exoplanet Exploration Program, Jet Propulsion Laboratory, National Aeronautics and Space Administration; Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, California.
Last reviewed:February 2019
Show previous versions
- Exoplanet, published July 2018:Download PDF Get Adobe Acrobat Reader
- Extrasolar planets, published 2014:Download PDF Get Adobe Acrobat Reader
- Detection techniques
- Direct imaging
- Indirect detection
- Exoplanet properties
- Planetary orbits
- Planetary masses and radii
- Planetary atmospheres
- Habitable zone
- The planetary zoo
- Solar system analogs
- Hot Jupiters
- Related Primary Literature
- Additional Reading
Planets beyond our solar system. For millennia, humankind has known about most of the major planets in our solar system because these worlds are visible to the naked eye. Exoplanets, however, were not indisputably known until 1995, when astronomers discovered the first planet orbiting a typical star like the Sun. Since then, and using a variety of detection techniques, scientists have uncovered thousands of exoplanets. The current tally, as of February 2019, stands at nearly 4,000 confirmed exoplanets, with thousands more awaiting confirmation through corroborative measurements by additional instruments. Because almost all stars seem to form and host planets, this running tally is but a small fraction of the hundreds of billions of exoplanets expected to exist just in the Milky Way Galaxy alone (Fig. 1). See also: Planet; Solar system; Star
The content above is only an excerpt.
for your institution. Subscribe
To learn more about subscribing to AccessScience, or to request a no-risk trial of this award-winning scientific reference for your institution, fill in your information and a member of our Sales Team will contact you as soon as possible.
to your librarian. Recommend
Let your librarian know about the award-winning gateway to the most trustworthy and accurate scientific information.
AccessScience provides the most accurate and trustworthy scientific information available.
Recognized as an award-winning gateway to scientific knowledge, AccessScience is an amazing online resource that contains high-quality reference material written specifically for students. Contributors include more than 9000 highly qualified scientists and 43 Nobel Prize winners.
MORE THAN 8700 articles covering all major scientific disciplines and encompassing the McGraw-Hill Encyclopedia of Science & Technology and McGraw-Hill Yearbook of Science & Technology
115,000-PLUS definitions from the McGraw-Hill Dictionary of Scientific and Technical Terms
3000 biographies of notable scientific figures
MORE THAN 19,000 downloadable images and animations illustrating key topics
ENGAGING VIDEOS highlighting the life and work of award-winning scientists
SUGGESTIONS FOR FURTHER STUDY and additional readings to guide students to deeper understanding and research
LINKS TO CITABLE LITERATURE help students expand their knowledge using primary sources of information