Maybe a week before it passes closest to the sun, the dark side of Comet ISON is expected to begin turning into the sunlight. The sudden exposure to the intense radiation could cause a strong outburst of gases into the coma--like a celestial popcorn kernel suddenly bursting.
UC Davis is acquiring a chunk of meteorite that landed in Northern California last year. The meteorite's age makes it rare and valuable. It contains dust from ancient stars that exploded, the same stuff that eventually formed our solar system.