“ Microwave-powered electric aircraft. The best bet for an all-electric aircraft is what US aerospace engineer David Kagan proposed in his... (read full comment) ” 

Posted on July 21, 2011 at 4:54 AM EDT

“ Was the Space Shuttle Program a Colossal Failure? Yes, because for four decades it kept US astronauts in extreme low-Earth orbit, instead of... (read full comment) ” 

Posted on July 9, 2011 at 4:11 AM EDT

+ 1 more comment posted in this discussion

“ ESA spacecraft and solar electric propulsion ESA's new re-entry spacecraft and NASA's urgent need for solar electric propulsion add up to one... (read full comment) ” 

Posted on June 25, 2011 at 6:54 AM EDT

“ Boot-prints on an Asteroid NASA should select the nearest asteroid (hopefully within the Moon's orbit), as recommended by aerospace engineer David... (read full comment) ” 

Posted on May 24, 2011 at 6:35 AM EDT

“ Better options available Have to agree with Kitz that there are far better methods to dispose of nuclear waste, but--hey wait a minute! Maybe our... (read full comment) ” 

Posted on May 3, 2011 at 6:35 AM EDT

“ Japan's Nuclear Crisis is a Wake-Up Call A 9.0 magnitude earthquake may breach the coolant pipes even in the latest nuclear power plant designs.... (read full comment) ” 

Posted on March 15, 2011 at 6:15 AM EDT

“ Solar Power Rules Really excellent alternative way to extract oil cheaply using an environmentally-sensitive method which, I believe, was first... (read full comment) ” 

Posted on February 25, 2011 at 3:32 AM EST

“ Clean Energy Spared Cuts Thank heavens President Obama hasn't caved in to the GOP's neocon agenda and will actually double the spending for clean... (read full comment) ” 

Posted on February 19, 2011 at 1:56 AM EST

“ Alternative Energy Excellent article. But can this new alternative energy project provide as much electricity to our cities as space-based solar... (read full comment) ” 

Posted on February 10, 2011 at 2:09 AM EST

“ Space Solar Power as Part of Clean-Energy Goal President Obama has opened the door to space solar power employing high-intensity microwaves to... (read full comment) ” 

Posted on January 27, 2011 at 12:33 AM EST