June 4th, 2008

in motion

meanwhile, on mars...

It's quiet out there.

The long Martian twilight (compared to Earth's) is caused by sunlight scattered around to the night side of the planet by abundant high altitude dust.  Similar long twilights or extra-colorful sunrises and sunsets sometimes occur on Earth when tiny dust grains that are erupted from powerful volcanoes scatter light high in the atmosphere.

(NASA image, by way of Whimsy)