“… there are no major technological barriers keeping us from harvesting the resources of the Moon and asteroids. All the barriers are financial.”
Opportunities to see Mercury are rare. Right now, it is reaching its greatest elongation and is in an optimal position for viewing shortly after sunset.
This is Mercury's best evening showing for 2020, for the Northern Hemisphere. It'll show itself at dusk/nightfall - near the sunset point - for the next few weeks. Southern Hemisphere? Click in and read more.
Twice each day, something strange happens to the atmospheric pressure on Mars.
So many odes to Oppy are popping up today. It’s heartening to see the influence this tough little robot had on so many.
Image: Opportunity at its final resting place in Perseverance Valley, courtesy of NASA
“Writing science fiction is a race between the author’s imagination and the progress of science and history.”