Respuesta :

Hi There!!

Your best answer choice is:

-Sputnik 1 1957.

-Sputnik 2 1957.

-Explorer 6 1959.

-Vostok I 1961.

Well, I really don't know these are the correct orders....

But, I hope this helps you!

:)

Answer:

first humans on the moon, first lander on Mars, first space shuttle flight

Explanation:

I checked and it's correct. promise

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