In the same way that Earth sunsets pick out the reds and oranges of normal light on the planet, Martian ones emphasise the blue of the sky.
But then, though Alvin may know his way around a fish store, he isn't the brightest light on the planet.
The answers could shed light on the planet's potential to support life – even if that was just microbial life – long ago.
They perceive that the light on the planet is increasing, even if the news shows otherwise.
"Come," she says, inviting me into her home, where I sit on cushions and talk with her and her Guadaloupe-born husband about "living light" on the planet, especially after the eco-disasters in Japan.
Emily Main is senior editor at the National Geographic Green Guide and thegreenguide.com, where she writes about practical ways to live lighter on the planet without having to completely rearrange one's life.
About 12 billion electric lights on the planet use Edison bulbs; a third are in the U.S. So, lighting up the world consumes about 2 trillion kilowatt-hours annually, or one-eighth of all electric power.
It's about living lighter on the planet, living more simply so you can focus on what matters, and creating more personal freedom to be authentically you.
Being vegan doesn't make you better or smarter than anyone else, but it allows you to live a bit lighter on the planet, which is a good thing.
We compare predictions of Jupiter and Saturn׳s bulk compositions from different formation scenarios, and highlight the key measurements required to distinguish competing theories to shed light on giant planet formation as a common process in planetary systems with potential applications to most extrasolar systems.
