dDuring the aApollo 17 mission, the astronautes and the scientists tried to knowdetermine the moon 's age .

Apollo is a proper noun so is capitalised

using a methods .

Grammatically, this would be "using a method" but it's also kind of meaningless clause. Everything is done via _some_ method, so it's too generic to be useful here if you don't explain the method.

tTheir findings showed that the moon is 40 million years older than we thought and it has a crucial role in humanbeing Earth's habitability and in to the weather also

habitability is applied to the environment rather than the inhabitants.

hHow old is the moon?

dDuring the aApollo 17 mission, the astronautes and the scientists tried to knowfind out the moon 's age .

uUsing acertain methods, .

their findings showed that the moon is 40 million years older than we thought and that it has a crucial role in humanbeing Earth's habitability and in for humans and also the weather also.

"Habitability" means for an environment (ie something as small as a tent or dwelling or massive as a planet) to be able to be inhabited by humans. Us humans can't be "habitable" because, well, we can't live in each other. For planets, there's a term called "planetary habitability" and planets like Earth are in what we call the "habitable zone" within their solar systems.