Any planet has an extremely faint light source compared to its parent star. In addition to the intrinsic difficulty of detecting such a faint light source, the light from the parent star causes a glare that washes it out. For those reasons, very few of the extrasolar planets reported as of March 2014 have been observed directly, with even fewer being resolved from their host star.
CITATION STYLE
Hatzes, A. P., Cameron, A. C., Gould, A., & Claudi, R. (2016). Methods of Detecting Exoplanets. Annual Review of Astronomy and Astrophysics (pp. 3–86). Retrieved from http://link.springer.com/10.1007/978-3-319-27458-4
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