“It’s leap year time… so what are years, anyway? And what do they have to do with the supermassive black hole in the core of the milky way?” minutephysics has the answer in this YouTube video…
(Source: https://www.youtube.com/)
Friendship 7: Celebrating 50 Years of American Spaceflight
Friendship 7: Celebrating 50 Years of American Spaceflight
NASA posts:
On this 50th anniversary of John Glenn’s historic Mercury flight, visit our interactive feature http://t.co/GOOmz7CH and the documentary http://bit.ly/zppMPM
