No real "scientist" believes that aliens exist, just as no real scientist 'believes'
that aliens do not exist. That's just a simple fact that comes from simple
definitions. A real 'Scientist' is an observer who draws conclusions from what
he observes. His conclusions have nothing to do with opinion, faith, judgment,
or what he believes or doesn't believe.
No observation by astronomers, astrophysicists, cosmologists, biologists,
physicists, or anyone else has provided any evidence yet that points to the
existence of life outside of Earth, or any evidence that rules it out. So nobody
has any scientific basis for 'believing' either way ... even though many people,
including many scientists, have a strong hunch that it does exist.
There is no proof that aliens exist. I believe there is no such thing as aliens. Has anyone seen an alien ship? Has anyone seen an alien? No.
A person has every right to believe in aliens if they choose too. There is no concrete evidence that aliens exist, but that doesn't mean that they don't.
Probably Mars where no has been. No one can prove there are Aliens on that planet except for scientist that have done experiments, research and lots of other scientific stuff
Scientists believe that there is liquid water, under the crust of Europa.
Unidentified flying objects? Yes, anything in the sky that we can't recognize is unidentified. Flying saucers or alien spacecraft? There is NO evidence for this, and no reason to believe that they exist. not really you really think they exist they might WHO KNOWS!!!
Scientist believe there are but none have been found yet. We are currently in the process of searching for an exoplanet in the habitable zone. Also Scientist believe bacteria life could exist on Mars and Saturn's Moon Titan.
A scientist may or may not believe in God. A non-scientist also may or may not believe in God.
Aliens don't exist
There is no scientific proof that alien races exist in the universe so we have no idea what they might look like if they did exist.
No.
No. No alien species are known to exist at this time.
If aliens exist, the alien races may have mammavian characteristics.