No way! Earth is the only planet in the infinite universe with life on it. I know this because that's what I have been told by my government since the day I was born

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It is interesting to see the alien agenda being rolled out so quickly lately. It has been being nurtured covertly for decades but now mainstream science is jumping on the bandwagon. An "alien threat" is one of the plans to further the One World Government agenda. "They" need global threats to have a need for global government. Hence the global warming scaremongering, the "terrorist" fearmongering, and soon the "alien threat" fearmongering.
Everyone should read the report from Iron Mountain published in the 60's. He didn't have a crystal ball. He was part of a government think tank who blew the whistle by publishing their white paper on how to control the world's population when all the countries were disarmed and they couldn't control us through fear of war with other countries.
An excerpt from the book:
Remember this was a white paper from the think tank back in the early 60's!
Substitutes for the Functions of War: Models
The following substitute institutions, among others, have been
proposed for consideration as replacements for the nonmilitary
functions of war. That they may not have been originally set forth
for that purpose does not preclude or invalidate their possible
application here.
1. Economic. a) A comprehensive social-welfare program, directed
toward maximum improvement of general conditions of human life. b)
A giant open-end space research program, aimed at unreachable
targets. c) A permanent, ritualized, ultra-elaborate disarmament
inspection system, and variants of such a system.
a. Political. a) An omnipresent, virtually omnipotent
international police force. b) An established and recognized
extraterrestrial menace
(nurtured and now becoming mainstream). c) Massive global environmental pollution
(latest example is the intentional oil spill.) d) Fictitious alternate enemies
(Al Quada!).
3. Sociological: Control function. a) Programs generally derived
from the Peace Corps model. a) A modern sophisticated form of
slavery. Motivational function. a)Intensified environmental
pollution. b) New religions or other mythologies. c) Socially
oriented blood games. d) Combination forms
4. Ecological. A comprehensive welfare program, or a master
program of eugenic control.
5. Cultural. No replacement institution offered. Scientific. The
secondary requirements of the space research, social welfare,
and/or eugenics programs.
Full text of the Iron Mountain report here. Short but VERY interesting reading.
http://www.nationoftexas.com/docs/iron.txt