From the era when actual space travel was brand new...
...and flying saucers were
probably real. from
Race for the Moon #3 (1958).
Pencils
by Jack Kirby, inks by Al Williamson, an absolutely magnificent combo,
rivaling Kirby's pairings with Wally Wood and Joe Sinnott!
Science fiction was in a state of flux as real-world science began catching up with our imaginations.
Instead
of far-future sagas with warp-drive ships, tales of "the day after
tomorrow", when we would make our first landings on the Moon and Mars
came into vogue.
That didn't mean that visitors from beyond our
Solar System were left out, but the technology we used to respond to
them (friendly or not) was much closer to "present-day" (1950s) tech
than ray-guns and photon drives.
It's sad that, now that we're actually in the era shown in these tales, we haven't done anything close to what they show...