If Such A Thing Had Happened Once,

It Will Be Possible In A Few More Years To Build Radio Controlled Rockets Which Can Be Steered Into Such Orbits Beyond The Limits Of The Atmosphere And Left To Broadcast Scientific Information Back To The Earth. A Little Later, Manned Rockets Will Be Able To Make Similar Flights With Sufficient Excess Power To Break The Orbit And Return To Earth. (1945) [predicting Communications Satellites.]

No Trilogy Should Have More Than Four Books.

One Orbit, With A Radius Of 42,000 Kilometers, Has A Period Of Exactly 24 Hours. A Body In Such An Orbit, If Its Plane Coincided With That Of The Earth's Equator, Would Revolve With The Earth And Would Thus Be Stationary Above The Same Spot On The Planet. It Would Remain Fixed In The Sky Of A Whole Hemisphere ... [to] Provide Coverage To Half The Globe, And For A World Service Three Would Be Required, Though More Could Be Readily Utilized. (1945) [predidicting Geosynchronous Communication Satellites]

The Time Was Fast Approaching When Earth, Like All Mothers, Must Say Farewell To Her Children.

I Don't Believe In God But I'm Very Interested In Her.