Share Your Story • Pari Spolter • September 5, 2013
Equal areas are swept in equal intervals of time only at perihelion and at aphelion. A lecture by Dr. Pari Spolter, the author of Gravitational Force of the Sun.
reyadh saleh Mahdi: 2013/11/10 11:26 CST
Become a member of The Planetary Society and together we will create the future of space exploration.
Help advance robotic and human space exploration, defend our planet, and search for life.