Department Of Physics & Electronics

Two Spiral Galaxies..

What is a Wormhole?
A wormhole is a theoretical passage through space-time that could create shortcuts for long journeys across the universe. Wormholes are predicted by the theory of general relativity. But be wary: wormholes bring with them the dangers of sudden collapse, high radiation and dangerous contact with exotic matter.

I was reading a while ago a transcript of Stephen Hawking’s lecture on Space and Time Warps...and now I'm having a few more questions plus a bunch of scenarios that my brain is trying to evaluate.

Read the transcript here but warning...is addictive:
http://www.hawking.org.uk/space-and-time-warps.html

PHYSICIST OF THE DAY
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Heinrich Barkhausen
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(Born 2 Dec 1881; died 20 Feb 1956 at age 74.)
Heinrich Georg Barkhausen was a German physicist who discovered the Barkhausen effect (1919), a principle concerning changes in the magnetic properties of metal. His work in acoustics and magnetism led to the discovery that magnetization affects whole domains of a ferromagnetic material, rather than individual atoms alone. He discovered that a slow, smooth increase of a magnetic field applied to a piece of ferromagnetic material, such as iron, causes it to become magnetized, not continuously but in minute steps. With Karl Kurz, he developed the Barkhausen- Kurz oscillator (1920) for ultra high frequencies (forerunner of the microwave tube), leading to understanding of the principle of velocity modulation. He is also known for experiments on shortwave radio transmissions.