4 ms·
(a) source for that: http://imagine.gsfc.nasa.gov/docs/ask_astro/answers/970603.html http://imagine.gsfc.nasa.gov/docs/ask_astro/answers/970603.h...
by paulbaumgart 17y ago
(a) source for that: http://imagine.gsfc.nasa.gov/docs/ask_astro/answers/970603.html http://imagine.gsfc.nasa.gov/docs/ask_astro/answers/970603.h...