Study Astronomy AC.

There are many people who believe there is intelligent life in other constellations, other solar systems.

I'll just mention two. I could mention more. Hopefully it inspires you and others to look into these things on your own.

Pleiades Pleiadians
The Pleiades, also known as the Seven Sisters and Messier 45, are an open star cluster containing middle-aged, hot B-type stars located in the constellation of Taurus. The cluster is dominated by hot blue and luminous stars that have formed within the last 100 million years.
Computer simulations have shown that the Pleiades were probably formed from a compact configuration that resembled the Orion Nebula.
Astronomers estimate that the cluster will survive for about another 250 million years, after which it will disperse due to gravitational interactions with its galactic neighborhood.
Scientifically with the Pleiades a mere 100 million years of age, nothing more than marsupial life has formed there..known as Panspermia.

Orion & Greys
As Nebula's are volatile, the most volatile system known is Orion, which exploded creating Barnard's Loop 2 million years ago.
The Orion constellation is a Nebula with Red & White stars...do you understand what this means???
It's too VOLATILE to holding anything of a life-form as it births planets and stars which equals excessive radiation and constant nuclear style explosions. This knowledge nullifies the alleged Grey Alien's home system is designated in Orion.

I have info on Zeta Reptilians, Draconian Thuban Reptiles, Arcturus Arcturians and Sirius if you are interested, but I can tell you now - no intelligent life forms....just not possible.