When we see the shadow on our images, are we seeing the time 11 minutes ago on Mars? Or are we seeing the time on Mars as observed from Earth now? It's like time travel problems in science fiction. When is now; when was then? ↗
If NASA is to reach beyond the Moon and someday reach Mars, it must be relieved of the burden of launching people and cargo to low earth orbit. To do that, we must invest more in commercial spaceflight. ↗
Small samples in the centrifuge will spin at varying rates to create synthetic gravity, like the gravity of Mars or the gravity of the moon, and measure how the specimens respond within the centrifuge. ↗
The experts who managed the original Marshall Plan say Afghanistan needs a commitment of at least $5 to $10 billion over 5 to 10 years, coupled with occupation forces of 250,000 Allied soldiers to keep the peace throughout the country. ↗
It would be great some day to have astronauts in a rover on Mars. But just about anyone except an oil company executive would say its more important to have 50 million solar powered vehicles in the United States. ↗
The thing that sets Mars apart is that it is the one planet that is enough like Earth that you can imagine life possibly once having taken hold there. ↗