(CBS) Proof that life exists outside the boundaries of Earth continues to elude scientists, but President Bush's budget suggests that "space aliens" may be out there somewhere.
And it could just be a matter of time before they are discovered.
In a brief passage titled "Where Are the Real Space Aliens?" Mr. Bush's budget document says that several important scientific discoveries in the past decade indicate that "habitable worlds" in outer space may be much more prevalent than once thought.
The passage acknowledges that hard evidence of alien life has yet to emerge.