June 28 ~ Wal Thornhill
We cannot see what is not on our mental 'map.' Almost the entire visible universe is in the form of highly-conductive plasma but electrical discharge in plasma is nowhere on the map.
The red supergiant star Betelgeuse, the bright reddish star in the constellation Orion, has steadily shrunk over the past 15 years, according to researchers at the University of California, Berkeley. Betelgeuse's radius is about five astronomical units, or five times the radius of Earth's orbit. The average speed at which the radius of the star is shrinking over the last 15 years is approximately 470-490 miles per hour. That means the star's radius has shrunk by a distance equal to the orbit of Venus... [More]
(Note: Forgot to post this one when it was published - sorry...)