Fifty years ago today, the Soviet Union's Yuri Gagarin became the first human in space.

"Now let the other countries try to catch us," Gagarin declared after his return.

SODAHEAD SLIDESHOW: See the best space movie scenes ever.

Twenty-three days after Gagarin's flight, on May 5, 1961, American Alan Shepard became the second man in space -- for 15 minutes. 

On Feb. 20, 1962, American John Glenn followed in Gagarin's globe-circling footsteps, and on July 20, 1969, America succeeded in its own first: putting a man on the moon.

Since then, countless movies have tried to capture the magic of traveling to another world. 

From "Apollo 13" to "Alien" to "The Empire Strikes Back," let us know: What's the best space movie scene of all time?