There are most certainly many, many extrasolar planets that we cannot presently observe, or otherwise prove to be there directly. However, we know that statisti

There are most certainly many, many extrasolar planets that we cannot presently observe, or otherwise prove to be there directly. However, we know that statistically they are certain to exist. Below is a link to the best methods we currently have to detect them. http://en.wikipedia.org/wiki/Methods_of_detecting_extrasolar_planets http://en.wikipedia.org/wiki/Methods_of_detecting_extrasolar...