Original: Friday, April 13 - The asteroid 99942 Apophis (previously better known by its provisional designation 2004 MN4) will pass within 30,000 km (18,600 mi) of the Earth, very briefly appearing as bright as 3rd magnitude.
Simplified: Friday, April 13 - The asteroid 99942 Apophis (previously better known by its provisional designation 2004 MN4) will pass within 30,000 km (18,600 mi) of the Earth.