116. Earthlike Planets
See Terrestrial Planets.
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117. Eccentrics
An offcenter circular path.
Earthlike planets - small, dense, rocky.
Tidal Coupling
The locking of the rotation of a body to its revolution around another body.
Tools such as radio telescopes and spectrometers are now helping us to find objects that were only theories such as black holes, antimatter, dark matter, and even earthlike planets.
10. As yet there is no direct evidence that Earthlike planets orbit other stars.(Hint)
11. In estimating whether intelligence arises and develops technology, we have only life on Earth as an example. (Hint) ...
Speculation that other planetary systems exist dates back to antiquity, and through the years ever increasing numbers of astronomers searched for earthlike planets circling sunlike stars.
 See also: Solar, Earth, Solar System, Planet, Astronomy
  
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