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David S F Portree

Farewell and Follow Me

Apr 9, 2015 9:16 PM

Strategic Defense: Military Uses of the Moon & Asteroids (1983)

Feb 22, 2015 3:31 AM

Fun with Killer Asteroids

Jan 27, 2015 10:09 PM

The Challenge of the Planets, Part Three: Gravity

Jan 25, 2015 1:44 PM

The Challenge of the Planets, Part Two: High Energy

Jan 16, 2015 10:39 PM

The Challenge of the Planets, Part One: Ports-of-Call

Jan 6, 2015 8:27 PM

Beyond Apollo Welcomes Comet Lovejoy

Dec 31, 2014 8:21 PM

Centaurs, Soviets, and Seltzer Seas: Mariner 2's Venusian Adventure (1962)

Dec 20, 2014 3:47 PM

Bridging a Gap: Bellcomm's 1968 Lunar Exploration Program

Oct 23, 2014 11:42 PM

Dreaming a Different Apollo

Oct 13, 2014 3:42 PM

One-Man Space Station (1960)

Sep 28, 2014 8:38 PM

Wernher von Braun's Fantastic Vision: Ferry Rocket

Sep 15, 2014 12:59 AM

A 1996 Plan to Use NASA's Oldest Orbiter to Make Money on the Moon

Aug 15, 2014 9:44 PM

How Nasa saw space stations of the future in 1970

Aug 4, 2014 8:30 AM

This Was Your Daddy's (Or Possibly Grand-Daddy's) Space Station

Aug 4, 2014 1:19 AM

Assuming Everything Goes Perfectly Well: NASA's 26 January 1967 AAP Press Conference

Jul 19, 2014 3:19 PM

High Noon on the Moon (1991)

Jun 29, 2014 1:54 PM

Pluto: Doorway to the Stars (1962)

Jun 14, 2014 2:10 AM

A Relocated, Relocatable Main Engine Cluster for the Space Shuttle (1975)

May 18, 2014 4:29 AM

North American Aviation's 1965 Mars/Venus Piloted Flyby Study: the Flyby CSM

May 6, 2014 1:23 AM