Learn Spanish (Latin America): El cohete de esta misión llegará a la luna pronto. - The rocket of this mission will arrive at the moon soon.

In the future simple tense, regular verbs like llegar keep their full infinitive form and add specific endings. For the "he/she/it" form (like el cohete), you add -á. This ending always has an accent mark, which tells you to put the voice stress on that final syllable: lye-gah-RAH.

I learned that we can say va a llegar for the future. Why use llegará here instead?

You can absolutely say va a llegar (is going to arrive)! That is the "informal future," which is very common in spoken Spanish, especially for things happening very soon or plans already made. However, llegará uses the "simple future" tense. It is often used for predictions, distant future events, or in slightly more formal contexts like news about a space mission.

Why do we say a la luna when the English translation says "arrive AT the moon"?

In English, we arrive "in" a city or "at" a building. In Spanish, verbs of motion like llegar (to arrive) and ir (to go) are almost always followed by the preposition a (to) to show the destination you are moving toward. So, in Spanish, you literally say "arrive to the moon."

Why is it esta misión instead of este misión?