Fire vs. Ice: The science of ISON at Perihelion

After a year of observations, scientists waited with bated breath on Nov. 28, 2013, as Comet ISON made its closest approach to the sun, known as perihelion. Would the comet disintegrate in the fierce heat and gravity of the sun? Or survive intact to appear as a bright comet in the pre-dawn sky?

Was Titanic sunk by rare lunar event?

Exceptionally high tides caused by a rare conjunction of celestial events could have placed the fateful iceberg in the Titanic's path.