Because thait might be completely different from what we’re imagining. Because it might be completely different from what we’re imagining.

Extraterrestrial life = it Aliens = they

BThat's because thate extraterrestrial lifeform might be completely different from what we’re imagining. That's because the extraterrestrial lifeform might be completely different from what we’re imagining.

BecauseAfter all, thatey might be completely different from what we’re imagining. After all, they might be completely different from what we’re imagining.

As for an Uccording to urban legends, they have very advanced intelligence and a dimension might be differentmight come from a different dimension. According to urban legends, they have very advanced intelligence and might come from a different dimension.

According to = as stated by, as reported by

As for aIn Uurban legends, they have very advanced intelligence and atheir dimension might be different. In urban legends, they have very advanced intelligence and their dimension might be different.

As for an Uccording to urban legends, they have very advanced intelligence and a dimension might be different.since they are from a different dimension and possess advanced intelligence, According to urban legends, since they are from a different dimension and possess advanced intelligence,

I think it said we, who live in third dimension that we can't look at, are unable to perceive them. I think it said we, who live in third dimension, are unable to perceive them.

You could also say: "we, who live in only three dimensions..."

I think it was said that because we live in thirdree dimensions that we can't look at're not able to see them. I think it was said that because we live in three dimensions that we're not able to see them.

"look" is an intentional action, but since in this case the idea is that you just can't see them ever (even unintentionally) it's better to use "see".

I thinkit its said we live in third dimension that we can't look atthat we, being in the third dimension, are unable to see them. it is said that we, being in the third dimension, are unable to see them.

Of course, their language iswould be completely different. Of course, their language would be completely different.

This is a hypothetical, so you say "would". If you say "is", you're talking about a specific language we already know about.

Of course, their language iswill be completely different. Of course, their language will be completely different.

Since we're still in a hypothetical situation, "will be" is more natural than "is" here.

OAnd of course, their language is likely to be completely different too. And of course, their language is likely to be completely different too.

HuhWait!!! Wait!!!

Maybe we’ll have to learn an alien language in the future. Maybe we’ll have to learn an alien language in the future.

MaybeDoes that mean we’ll have to learn an alien languages in the future? Does that mean we’ll have to learn alien languages in the future?

It sounds like SF, but maybe When itscience fiction, but maybe one day it will becomes a reality. It sounds like science fiction, but maybe one day it will become a reality.

SF works, but science fiction sounds better, as it is clearer what you mean.

It sounds like SF, but maybe Whensome day it becomes reality. It sounds like SF, but maybe some day it becomes reality.

You can also go closer to your Japanese construction: "Maybe there will be a day when it comes true"

It might sounds like SFci-Fi, but maybe Wthen it day will actually come when this becomes a reality. It might sound like Sci-Fi, but maybe the day will actually come when this becomes a reality.

BWhere you believe it or not, it’s up to you. Where you believe it or not is up to you.

Your original sentence makes it sound like it's up to us whether it happens at all, not whether we believe it or not.

「Will the day come when an extraterrestrial life is revealed? 」 Will the day come when extraterrestrial life is revealed?

An extraterrestrial life (form) = a specific alien Extraterrestrial life = the existence of aliens in general We don't use「」in English at all. You could use " " for quotes though.

「"Will the day come when an extraterrestrial life is revealed? 」" "Will the day come when an extraterrestrial life is revealed?"

English uses " quotation marks

If it were suddenly announced on TV, "This is an eExtraterrestrial life has been discovered", we would be confused. If it were suddenly announced on TV, "Extraterrestrial life has been discovered", we would be confused.

I think "have been discovered" is much more natural. If you phrased it as "there is extraterrestrial life", people might be confused and want more details. "Aliens have been discovered" would sound even more natural, as extraterrestrial life is a bit scientific.

If it were suddenly announced on TV, "This is an extraterrestrial lifeform", we would be confused. If it were suddenly announced on TV, "This is an extraterrestrial lifeform", we would be confused.

Life is uncountable, so would not take "an". "This is an extraterrestrial lifeform" gives images of someone pointing to a single specimen by the way. A more natural way someone might phrase it is "We have discovered extraterrestrial life" Also in general, "extraterrestrial lifeform" is a bit of a broad term, and could count things like.... bacteria or moss if we found it on another planet. If you're thinking of an intelligent, human scale creature, people would probably use alien in this example.

If it were suddenly announced on TV, "This is an extraterrestrial lifealien", we wouldmight be confused. If it were suddenly announced on TV, "This is an alien", we might be confused.

1) If it is a the headline or the news anchor is beginning with an introduction, they might say "Extraterrestrial life has been found". Then when they are showing the 宇宙人, they will likely just say "This is an alien (that we are seeing right now)". 2) "might" is closer to かもしれない than "would"