"Question:
Someone told me that according to Judaism, human beings are the only conscious beings in the universe. Is there any basis to this?
Response:
Certainly not! ...
...
Sources in Torah
The Lubavitcher Rebbe pointed out that there is support in Torah for the notion that life exists on other planets. Furthermore, we can know something about that life through deduction from what the Torah tells us. Here is his argument:
In the Book of Judges (5:23), Deborah the prophetess sings about the victory of Barak over Sisera. In her song, she says, “Cursed be Meroz! Cursed, cursed be its inhabitants, says the angel of G‑d!”
Where is Meroz, and who are its inhabitants? The Talmud gives two explanations, one of them being that Meroz is a star or planet. The heavenly bodies had also come to help the Israelites, as Deborah stated just one verse earlier, “From the heavens they fought, the stars from their orbits . . .” This star, however, which was the dominant star of Sisera, apparently did not come to their aid. And so, General Barak penalized Meroz—and its inhabitants."
Is There Life on Other Planets - The Jewish view on UFOs aliens and extraterrestrial intelligence - Questions Answers