"We begin with Ann Druyan, widow of Carl Sagan, with a story about the Voyager expedition, true love, and a golden record that travels through space. And astrophysicist Neil de Grasse Tyson explains the Coepernican Principle, and just how insignificant we are".
"The solid inner core currently grows by as much as 6,000 metric tons every second".
"So far, only about 4 percent of the core has frozen, leaving plenty of energy to keep the magnetic field going for potentially billions of years".
I just cannot wrap my mind around these numbers.
Just like the Horse Head Nebula. It's been burning gases for millions of years and is 2 to 3 Light Years across- that's a lot of gas.
Description A dark nebula, also called an absorption nebula. The nebula was first identified and recorded in 1888 by Williamina Fleming at the Harvard College Observatory.
Location The nebula is found in the constellation Orion, in the Northern Hemisphere.
from Earth 1,500 light-years
Size Between 2 and 3 light-years across
- University of PhoenixCommunications, 2014
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