Great educational video that every adult and child should watch. Excellent teacher resource.
Happy New Year!
"The past is a ghost, the future a dream. All we ever have is now." –Bill Cosby
Have a great year fellow Universlings.
Aldrin poses on the Moon, allowing Armstrong to photograph both of them using the visor’s reflection. Apollo 11 July 20, 1969. Original Photo: NASA
Although intelligence is important, it is even better to be kind. Intelligence without empathy is nothing but wasted talent and a downward spiral for humanity.
Every atom in your body came from a star that exploded. You are quite literally a child of the stars :)
From the movie Contact (1997) Starring Jodie Foster. Written by Carl Sagan.
Just a little reminder from the great Sagan.
What’s really happening when you have a drink of water.
Artistic rendition of our solar system.
The moon rising.
Neptune comes closest to Earth on August 26, 2013. This occurs when the planet makes its closest approach to the point directly opposite to the Sun in the sky – an event called opposition. Since the Sun reaches its greatest distance below the horizon at midnight, the point opposite to it is highest in the sky at the same time.
We’ve seen them in our most beloved sci-fi movies (Contact anyone?) and series (Star Trek, Dr. Who), we’ve heard physicists, astrophysicists and astronomers speak of it with great enthusiasm and interest. But what exactly are these cosmic phenomena?
Wormholes are solutions to the Einstein field equations for gravity that act as “tunnels,” connecting points in space-time in such a way that the trip between the points through the wormhole could take much less time than the trip through normal space.
The first wormhole-like solutions were found by studying the mathematical solution for black holes. There it was found that the solution lent itself to an extension whose geometric interpretation was that of two copies of the black hole geometry connected by a “throat” (known as an Einstein-Rosen bridge). The throat is a dynamical object attached to the two holes that pinches off extremely quickly into a narrow link between them.
Theorists have since found other wormhole solutions; these solutions connect various types of geometry on either mouth of the wormhole. One amazing aspect of wormholes is that because they can behave as “shortcuts” in space-time, they must allow for backwards time travel! This property goes back to the usual statement that if one could travel faster than light, that would imply that we could communicate with the past.
Wormhole geometries are inherently unstable. The only material that can be used to stabilize them against pinching off is material having negative energy density, at least in some reference frame. No classical matter can do this, but it is possible that quantum fluctuations in various fields might be able to.