Equally unexpected was the next gigantic stride, when man moved out of his very orbit to a point more than 20 million miles to Earth.

11 seconds sound clip from the 20 Million Miles to Earth (1957) movie soundboard.

You can hear this line at 00:00:26.719 in the Blu-ray version of the movie.

Quote context

[...]

- Great scientific advances are oftentimes sudden-accomplished facts before most of us are even dimly aware of them. Breathtakingly unexpected, for example, was the searing flash that announced the atomic age.

- Equally unexpected was the next gigantic stride, when man moved out of his very orbit to a point more than 20 million miles to Earth.

- Pepe, is it your desire that the fishes, they swim away? Come on! Pull up on the net. Here.

- Many ropes to catch a little fish. Now, in Texas, just for one little rope, she catches a big cow.

- The net. The net!

- Texas... Texas! What is that? Oh, Mondello, you do not know of Texas? She's a big country across the sea, near America. That's where the cowboys...

- Silenzio!

[...]