What is "megameters"

Usage examples of "megameters".

For a moment, he thinks he can see something in the distant mist, an indeterminate distance away – it's hard to distinguish centimeters from megameters, with no scale indicator and a horizon a continental distance away – but he's not sure what it is.

In another direction, the cylinder that was the T machine whirled, its mass and might brought by a tiny distance - about fifty megameters, hardly more than the Circumference of a terrestroid planet-down to a bit of jewelry adrift in heaven.