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This has been a glorious week for solar observers! Led by large sunspot region AR1339, the sun's disk is alive with activity... the most dynamic show in many years. I made two interpretations - which do you prefer? A close-up view of 1339 can be seen here . This image was featured on NASA's Astronomy Picture of the Day .
The current cosmological census is that the universe began 13.7 billion years ago with the Big Bang. But a legendary physicist says he's found the first evidence of an eternal, cyclic cosmos. The Big Bang model holds that everything that now comprises the universe was once concentrated in a single point of near-infinite density.