Its possible, I actually think if there is alien life in the Universe around our level of development its likely they could have space probes similar to ours floating around in space. Statistically speaking its virtually impossible that Earth is the only planet with life on it and bearing that in mind its highly possible these aliens could assume that they may be the only sentient life form in the universe and that they may have space programs similar to ours if they are at or near our level of development. To be fair its also just as likely that all other life in the universe is plant or bacterial life but we have no where near enough evidence to state anything as a solid fact about extraterrestrial life.
@jorgevy: Statistically it is actually highly unlikely that Earth is the only life bearing world in the Universe, its simple numbers really, they've discovered many planets that meet all the standards required to sustain life , the likelihood that these are all lifeless worlds is actually pretty low.
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